What is the quickest way to work out at which floor the magic eggs would start to break?

Parameters

A tower with $100$ floors and no lift.

Box of unlimited magic eggs that don't break like regular ones.

All magic eggs have the same hardness$/$properties$.$

Can only drop one egg at a time from the tower window and collect another one from the ground floor.

Egg breaks or don't break, no in$-$between state

This is a logical question and not a trick one.