How do I start a 90 minute timer?

It is already set. Press Begin and the hourglass starts draining for 90 minutes. Nothing to install and no account.

Completely, with no sign-up and no account. Nothing you type ever leaves your device.

90 Minute Timer

Ninety minutes is roughly one ultradian cycle, the natural rhythm your attention already runs on. It is the longest block most people can hold without a real break, and the standard unit for serious creative work.

Set for 90 minutes and ready to start. Good for one full ultradian cycle of deep work.

One ultradian cycle

Your attention already runs on a roughly ninety-minute rhythm, the same cycle that structures sleep. Working with it rather than against it is why ninety minutes is the standard block for serious creative work, and why the trough afterwards is real and worth respecting.

Best suited to composers, writers, and anyone doing hard creative work.

Should I take a break after 90 minutes?

Yes, and a real one, ideally twenty minutes away from screens. The dip after a full cycle is physiological rather than a motivation problem, and pushing through it costs more than it gains.

Other timer lengths

Session

Live clock 0Day time 12:00

Progress (debug) 0.35

SAND. Bottom pile is graded like the top one — no light/shadow split; its colour follows the time of day. Cone lift is what separates the raised pile from the flat bed behind it.

Cone lift over bed -0.040Cone apex shadow 0.085Cone base / bed contact 0.180Bed — night -0.400Bed — midday -0.300Rim off — top cap 0.04Rim off — base 0.04

FALLING SAND. Ported from the app (lib/hourglass/hourglass_painter.dart) — accelerating grains, same constants. Defaults ARE the app's values.

Grain count 220Column width 1.00Fall period (s) 0.82Exit speed 0.30Grain size 1.20Grain opacity 1.00Grain brightness 0.020Impact scatter 0.60Land into pile (px) 0.0

PILE GATHERING. The sand spreads evenly first, then a pile starts small and builds. Start = when the mound begins, Ramp = how much more drain until it is the full solved cone.

Pile starts at 0.00Pile ramp 0.25Early spread nudge 0.000Colour settles over 0.25Bed level handover 0.60Top final dump at 0.800...having shown only 0.995Stream thins from 0.97...down to 0.20

Copy tuned stream back to me:

Trace horizon line 0

Horizon Y = 0.4475 — send me this number to bake it.

Place sun/moon 0

SUN — edit one key at a time.The rendered sun blends between these three by the sun's height, so whatever you set here is what shows at that time of day. Scrub Day time to preview.

Sun key sunriseSun size 0.020Core size 2.00Core strength 2.40Sun glow size 0.38Sun glow strength 1.15Far glow size 0.07Far glow strength 0.30Core colour Sun glow colour Far glow colour

Copy tuned keys back to me:

MOON — all parameters.Painted disc (plates/moon-tex.png) plus a shader halo and sky spill. Rises 21:45, sets 05:30.

Moon size 0.040Moon brightness 1.20Edge softness 0.07Halo size 1.30Halo strength 1.50Sky spill size 0.540Sky spill strength 0.16Surface detail 0.50Low-moon warmth 0.55Low-moon haze 0.30Fades out by height 0.35Low-moon tint Disc tint Halo colour Sky spill colour

Copy tuned moon back to me:

Place=1, then drag the sun/moon in the sky — it edits the phase you're viewing (scrub Day time to reach it). Moon shows today's real phase.

Sand light — Mid Day

Edit phase Mid DayExposure 1.00Saturation 1.00Lit light (key) Shadow light (sky)

These edit the selected Time-of-day phase. Mid Day is the anchor (identity).

The Rim light (in Glass optics, locked) auto-scales per phase — strong at night, dim by day — so the hourglass stays the hero.

Scene (bare-glass experiment — rejected)

Draw coded glass 0Refraction 0.35Glass tint (rim absorption) 1.00Fresnel rim 0.60Glass texture 0.15Glass wall opacity 0.90Glass wall width 2.2

Glass fit — frame (position & size)

Center X 0.498850Top Y 0.347Neck Y 0.627Bottom Y 0.888Max half 0.065Neck half 0.003Show glass edge 0

Curve — top bulb

Rim corner 0.79Widest Y 0.370Upper fullness 0.075Lower fullness 0.345Neck approach 0.080

Curve — bottom bulb

Width scale 0.985Widest Y 0.700Neck exit 0.150Upper fullness 0.375Lower fullness 0.110Base corner 0.91

Curve — ends (under the caps)

Top rim width 0.000Base width 0.000

Outline nodes — drag on canvas

LOCKED — 100% outline

Set Show glass edge = 1, then drag the white dots(anchors) or blue dots (curve handles) — on either side; the two halves stay mirrored. Drag anywhere off a point to move the whole hourglass. 7 nodes per side: 5 around the top, 5 around the bottom, 1 neck.R restores the locked outline · Shift+R reverts to slider-driven.

Sand — shape & style

Anime flatness 0.20Pile top-view (ellipse) 0.090Sand amount 0.75Pile angle 0.545Pile apex round 0.07Top sand bulge 0.30Crook — top (minute) 0.0010Crook — bottom pile 0.015Crook frequency 26

Sand colour — TOP (shadowed)

Hue 30Saturation 34Lightness 0.52Lit edge 0.000Shadow depth 0.000

Sand colour — BOTTOM (half lit)

Hue 30Saturation 34Lightness 0.65Lit flank 0.060Shadow depth 0.245

Sand — texture

Texture amount 0.07Texture scale (× width) 0.005

Glass optics & light

Sand sky-light 1.00Highlight strength 0.32Highlight softness (0 = anime) 2.0Highlight X 0.51Highlight width 0.15Highlight bow 0.25Highlight top 0.12Highlight bottom 0.65Rim light 0.20Inner glass shadow 0.40

Water — sea region

Edit sea area 0Shoreline softness 6

Drag markers to shape the sea. Double-click a marker to flip it straight ⇄ curved (square = straight corner, circle = curve), double-click open water to add one, right-click one to remove. The outline passes exactly through every marker.

Water — glitter

Amount 0.32Density 0.25Twinkle speed 0.25Shoreward slide per life 0.200Glint length (horizontal) 0.40Glint thickness 0.030Perspective (denser far) 1.20Light-path X 0.500Light-path width 1.00

Water — band placement

Horizon Y 0.4475Sill Y 0.17

H panel · L locked params.
DAY plate — LOCKED. Everything (outline · sand · optics · water) is baked. This is the daytime look, used between sunrise and sunset. Reopen the locked menu only to re-tune. Next: the other phase plates + rendered sun/moon.

90 Minute Timer

One ultradian cycle

Should I take a break after 90 minutes?

Other timer lengths

Session

Sand light — Mid Day

Scene (bare-glass experiment — rejected)

Glass fit — frame (position & size)

Curve — top bulb

Curve — bottom bulb

Curve — ends (under the caps)

Outline nodes — drag on canvas

Sand — shape & style

Sand colour — TOP (shadowed)

Sand colour — BOTTOM (half lit)

Sand — texture

Glass optics & light

Water — sea region

Water — glitter

Water — band placement

Train your focus.
Transform your life.

Advanced

Give up this session?

Well done

This session has ended

Settings

90 Minute Timer

One ultradian cycle

Should I take a break after 90 minutes?

Other timer lengths

Session

Sand light — Mid Day

Scene (bare-glass experiment — rejected)

Glass fit — frame (position & size)

Curve — top bulb

Curve — bottom bulb

Curve — ends (under the caps)

Outline nodes — drag on canvas

Sand — shape & style

Sand colour — TOP (shadowed)

Sand colour — BOTTOM (half lit)

Sand — texture

Glass optics & light

Water — sea region

Water — glitter

Water — band placement

Train your focus.Transform your life.

Train your focus.
Transform your life.