for me, it is roughly once every month so...sometimes longer when i have no spice. after breaking through i usually have a bit of a break to try and integrate the experience into my everyday life.
lately i have felt strongly tempted to start smoking more often as i feel a very positive relationship with the spice and am getting a deeper understanding of the experience with every breakthrough, but i am not sure whether this is the best idea. i feel really confident in hyperspace and i am noticing my ability to concentrate and learn during is getting better with every try.
how often do you guys breakthrough?

As often as needed.
I used to multiple times a day. Then every day. Then only when I felt the time was right. There reached a point where even a low dose, I could remember everything. I haven't had a "breakthrough" in a very long time, but can still remember every detail. Go with the flow and do what feels right.

Rarely.

Still working my way up to it! But like house said, do what feels right. Sometimes I look for a good lesson and load up a decent dose, and just see where it takes me. Other times, low doses have been very beneficial.