In reality, how much weight can a person gain in a week?

Ms_exotique
I lost weight from 118 down to 107 after a matter of days from stress and no appetite, I want to gain up to 120 and no higher than 130. I'm 20, 5'2 and gained 1 pound recently so I'm 108 currently, if any of that matters, lifting light weights and exercising some, and I started taking gnc pro gainer weight gainer 2 days ago so I'm going to see how that works. Any tips will be helpful.
In reality, how much weight can a person gain in a week?
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