in its/their entirety
Totally or completely. Darn, I was hoping to get a piece of cake, but it looks like it's been eaten in its entirety. A: "Did you finish the books in their entirety? In just one week?" B:"Yes! It's such a good series!"
in its entirety
and in their entiretycompletely; until completely done or gone. I watched the basketball game in its entirety. My friends and I ate the two large pizzas in their entirety.
in its/their enˈtirety
as a whole, rather than in parts: The poem is too long to quote in its entirety.