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I have a certain cell (Q16) can can be a 0 or 1, depending on the logic

If the value in Q16 is 1, I want a cell (W8) to start counting down from 15
to 0 in 1 interval seconds in such a way that I can still perform actions on
other cells.

Then, if the value in Q16 gets changed to 0 before the timer is up, the
timer pauses.

And once again, if the value in Q16 turns back to 1, the clock will start at
15 seconds again till it reaches 0.

I'm very new and have been reading up on Worksheet_Change but I am very
unfamiliar with it. Any help is appreciated.