please move this thread to Help. Devices is not intended for this
as for your question, you need:
Counter
but here they can bully me, so I will say this
you can use Repeator but it takes 500 memory, or you can use triggers according to the guide below
button
and the item you need will come, Barrier or prop
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take Counter set it to 240
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use repeator (please do not beat me for using it) and connect to Counter
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use wires
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(Repeator run tast ---- count down) -
connect the button to the Repeater and divide the wires like this
(Button preset — start Repeater)
and also connect the counter to the barrir or prop, they should be invisible, then do this:
(Target value reached — active barrier)