Most primers can be re-coated in an hour or two, It always says in the instructions on the can.
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I would paint after. Because you might have to do caulking after tiling and when u finish caulking then paint.
Caulking can be done either before or after painting depending on how steady a hand you have. Be sure to use a "Painter's" caulk, which is latex based. Silicone based chalks can NOT be painted over.
Silicone or latex caulking will it discolor the silver on mirror
Read the paint MFG recommendations for full cure, or 48hrs.
No, it shouldn't be used on surfaces like glass. It will have no real adhesion when it finally cures, and will soon flake off.