1. The answer depends on how long the package contents were exposed to ambient.
For MSL level =3 and exposure time less than 12 hours - baking is not required, drying with 5x exposure time at <= 10% RH will be enough.
For exposure time more than 12 hours - baking is required.
These questions are fully answered in JEDEC standard J-STD-033.
The most recent version of this standard J-STD-033C is available from JEDEC (after registration):
https://www.jedec.org/standards-documents/results/j-std-033c
2. Assuming drying or baking procedure is performed after every exposure to reset floor life - the number of baking and re-sealing procedures is not limited.
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