Animating object visibility from collections

Dear all,

Following Michail Soluyanov suggestion,

I succeed animating a full object collection.
I have 10 collections I want to animate sequentially.
How to animate every single object of each collection.

From collection 1
I want object 1 to appear after the frame 10
for object 2 after the frame 20

then for collection 2
object 20 after frame 100
object 21 after frame 110.

Thank you for your help

Dear All,

I have found a solution, now I need to deal with every collection
Collection 1, Collection 2…

Any Idea how to sort and select every object for example object1 then object2…