Gaining

I decided to finally start gaining on purpose,since its lockdown and holiday season because I think this is a perfect situation to gain fast. I always loved stretchmarks and I had some of them a couple years back when I was growing up and I really want to get a lot of stretchmarks(as big and red as possible) so my questions are:

How fast do I need to gain for them to appear?

How many pounds did you have to gain to get some stretchmarks?

(I currently weigh around 250 pounds/110 kgs)

I don't think there is a set formula here. It's more to do with gaining quickly than with actual size. How well your skin stretches also is a factor. I've known ladies who reached 400 without them and a lady who gave herself a couple from a particularly large buffet trip.