Trick question: it's until the heat death of the entire universe. You get turned into this long spaghetti that gets absorbed at an increasingly slowing rate. So your scalp or your feet never quite make it to the inside.
This may be less than accurate because I'm not an expert.
I'm going to guess yes, the mass increases. I'm not sure about physical size because it may just be density. But I also feel like I should stop talking out of my ass now.