ONCE IN HEAVEN, HOW MANY WILL SIN AND END UP IN HELL BEFORE ETERNITY IS 'OVER WITH'?

If satan sinned in heaven there is free will in heaven, and it is possible to desire sin. Assumably god would want his creations to have free will in heaven, angels or not, because isnt the point he doesnt want 'robots'? It didnt take adam and eve long to sin, they hadnt even had children yet, and they were supposed to be in the most perfect state of good nature and purity a being can be in. In heaven, given infinite time, couldnt you commit a sin and go to hell forever? God didnt forgive satan or a 1/3 of the angels,he punished all humanity for disobediance, so it wouldnt be fair to give other creations special breaks,