TimerPlanGuides
Every tool on this site answers one question in a box. These pages are for the cases where the answer needs more than a number — where the arithmetic is easy and the convention behind it is not.
The decimal hours guide is the one that costs money: 7:30 is 7.5 hours, not 7.30, and getting it wrong is worth about a week’s pay a year.
Work-to-rest ratios explains what the numbers in 40/20 and 20/10 actually train, and why the rest is the part people cut first and should not.
Lighting a call with your screen covers the practical use of a white panel: which white, how far away, and why a monitor beats a desk lamp.
Scheduling across time zones is about the three weeks a year when the gap between two countries is not what everybody remembers.
Decimal hours on a timesheet
7:30 is 7.5, not 7.30 — and the gap is a week a year.
Lighting a video call with your screen
The lamp you already own is the screen in front of you.
Scheduling across time zones
Why New York to London is five hours — except when it's four.
Interval work-to-rest ratios
40/20, 30/30, 20/10 — what the second number does.