Man: What do you do when you do the accounts?
Woman: I make out checks. So much to do and so little time to do it in.
Man: Do you think you’ll make it?
Woman: Sure. I’ll make it.
Man: But do you make enough money for everything you do?
Woman: Just enough.
.
.
So much to do and so little time to do it in.
1-What does “in” mean in this sentence?
Does it mean “in time”?
2-What does “make it” in these sentences?
Thank you
Yes, it means before the time is up.
Get something done within the allotted time.
So much to do and so little time in which to do it.
That is, trying to do the chores in the time available.
A common saying is:
So much to do and so little time.
I’ll finish.
I’ll get it done.
I’ll achieve the goal.
Thank you so much, Torsten 
Very nice.
Thank you so much, Arinker
Very nice.
What does “in” mean in this sentence?
So much to do and so little time to do it in.
Does it mean “in time”?
It means ‘so much to do within the so little time available’.
Thank you so much, Anglophile
Very nice.
