How to create timed level system ?

Hello
I am new on buildbox, and I use buildbox trial version. I have a problem with level system.
Can ı timed level system ?
Example ;
Start : start 0s - finish 4s
level1 : start 4s - finish 6s
level2: start6s - finish8s
GAME DİRECTİON :0
pls help me

 

s = second

 

no exactly time but pixels
you need to find the right balance between pixels for each scene and the game speed
like that you choose how long each scene run