Presentation Timer

Yes — the default template already splits the session into a Talk stage and a separate Q&A stage, each with its own duration, so the time for questions is set aside rather than left as an afterthought.

The display switches to OVERTIME and counts up instead of auto-advancing into Q&A, so the speaker or moderator can see exactly how far over and choose when to move on with a "Next stage" click.

Yes. Fullscreen mode enlarges the current stage, its remaining time and any warning or overtime state for a podium display, confidence monitor or projector.

Yes, and it depends on which of those three things happens — they're not the same. If the tab merely goes to the background or is minimized while staying open, on-screen updates pause (the display doesn't repaint while hidden), but the countdown keeps advancing against a monotonic timestamp, not a repeating tick — when you return, the remaining time normally recalculates correctly and the display catches straight up. The audible alert doesn't get the same free pass: the browser may suspend or throttle it enough that it plays late, only once you're back, or not at all. Device sleep or a locked screen is a different, less predictable case: neither that catch-up nor the alert firing at all is guaranteed there, since what actually happens to a paused browser tab across a real system sleep depends on the browser and operating system, not this page. Closing or reloading the tab or browser is different again, not just less reliable — nothing about this timer is saved, so the countdown itself is cancelled, not paused: there's no state left to catch up and no alert that can fire. For the best chance of hearing the alert, keep this tab open and active, keep the device awake, and ensure sound is allowed. Backgrounding the tab may delay or prevent the alert.