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Interviews are timed, so practice should be too. Pick a duration, put the clock in fullscreen on a second monitor, and solve the problem before it runs out. The last ten seconds blink so you notice them without watching the clock.
A common rule of thumb is 25 minutes for an easy problem, 35 for a medium and 45 for a hard one. If the timer runs out, read the solution, understand it, and re-attempt the problem a few days later rather than grinding past the limit.
Yes. The countdown is calculated from a fixed end time rather than counted tick by tick, so background throttling cannot make it drift. The remaining time also appears in the browser tab title while you work in another tab.
Yes. Type any number of minutes between 1 and 600 into the custom field and press Enter to load it. Every common duration also has its own page, such as /timer/45-minute-timer.
Yes, it is completely free, needs no account, and runs entirely in your browser - nothing is sent to a server.