Two different questions hide in this one: how long an application lasts on your hands, and how long a bottle lasts in your bag.

A chalk ban is about mess, not grip. Here is how to read your gym policy and what most lifters use when the block is off the table.

Both are magnesium carbonate. The difference is the delivery, and that changes the mess, the reapplication and where you are allowed to use it.

Liquid chalk is easy to get wrong the first time. Here is the short version of how to apply it so it dries fast and lasts through your working sets.