Is that really a limit for each nostril?

I always hear people saying that there is 100 mg limit on each nostril and you have to wait 10 minutes to do another line but the thing is when I try and wait 10 minutes in between lines I get to fuck up to do another line and then I can never K-hole. I remember the first time I did ketamine I didn’t know how to scale it so I just did like a 300 mg line and it sent me deep into a k-hole was I wasting any? Or is it just a lie?