Gaining

Have the house to myself for a week, how much can i gain in that time reasonably

I was going to attempt an answer.But with your profile height of 0 and weight of 0 I lost interest.
A brand new gainer is hard to judge.Could be 3 lbs.5 pounds .If you have a game plan garnered from reading the answers to the other questions you've asked over the years? Maybe 10 lbs.
5 years