counting time from a user action

[Vaupell]

i want to count 10 minuttes from a action.

A user clicks a botton / or another event happens that triggers a timestamp
to be marked.

how would i go about counting 10 minuttes, and activate a trigger after
those 10 minuttes ?

sort of a delay, and perhaps ewen if the user hits refresh
the display would just show something like 5minuttes togo.

all i need is the counting, i have no clue or no idea where to begin.