Timing how long a frame has been active

Question

I am trying to time how long a frame as been the active
frame. Once the frame is displayed, if the user doesnt press a
button to move to another frame after 6 seconds, the movie should
jump back to the previous frame it was at. I think the setInterval
function would be correct to use here to time the 6 seconds, but im
not sure how to clear the interval after. Here is my logic, (i know
this isnt correctly coded..)
If a button was pressed before the 6 seconds has elapsed,
then it would not jump to frame5, i think.. but im not really sure
if this will work for what i am tryin to do, and if there is a
simpler way. thanks for any advice

Answer 1

onEnterFrame does NOT execute once when the frame is entered
(despite its name). it executes repeatedly (ie, it starts a loop)
starting when the frame that contains its code is entered and
continues until the timeline to which it's attached no longer
exists or a delete onEnterFrame is executed.
in addition, you should always precede your setInterval()
statement with a clearInterval(). especially, when your setInterval
is attached to a frame. it's almost guaranteed that you'll have a
mess on your hands if you use the code given by madmac, unless you
add that clearInterval().