Should You Cut or Bulk?

For people who are in a position to gain muscle more easily, I’d consider going as high as 500kcal surplus per day for the short term. I would aim to limit it to ~250kcal max for advanced lifters, which is the equivalent of 1kg per month.

So if you are intentionally gaining at a quicker rate than that, you would also expect to be gaining a lot of body fat.