Arduino programming and how to wire

I want to attach 8 electric magnet (nc)via 8 port relais to an arduino.

all the electric magnets are time released within 15 miutes to off( open )

I need to be able to reset the system( with a button), where all magnets are active.
so i can attach the metal on it.
Then when a switch closes the timer has to start.
magnet 1 releases after 1 minute and stays off
magnet 2 releases after 2 minutes and stays off
and so on.