event time span analysis

#1
Hi,
I want to make an analysis which exhibit user events in the game according to his cumulative play time
The problem, every user has different events.
For example, A user enter the game and reached to level 2 and than leaved the game
B user enter the game and reached to level 4 and than leaved the game
C user play but didn't reach to any level up and therefore leaved the game

My desirable chart is
legend X - cumulative play time
legend y - % percentage of the users reached to any event

I want to be able to place the average time event ,
when does users in average reached to level 2 , 3 .4 ... etc

Thanks u all!!