Roshi is, on average, 210 seals, but it can be more (Han and 3rd Ay follow the same formula in their treasures, and I got Ay at 230, and some people get Roshi later on too.)

If you've gotten Yagura twice, then that's a total of 100-140 pulls done in there, likely 120. 50-70 more and you'll be at 150-210 and get Bee (most likely). And then after that you'll get Roshi in 30-90 pulls max. (Likely another 10-30, as Roshi tends to be the easiest one to get out of the 3 210 treasures, and won't come at 240, so don't let the big 90 scare you, it's literally worst case scenerio)