The IMs in HAM2 shift alignment after the HAM2 ISI trips, and as part of my investigation into the alignment shifts, I counted the number of ISI trips in a year.

Interestingly enough, Hugh and I both estimated 20-25 ISI trips in a year, however the number is much higher, at 94.

What I also discovered that in Commissioning Mode, the ISI trips an average of 10 times / month, while during the O1 run, the ISI trips an average of 5 times / month.

Since H1 was not vented, it's expected that the IM alignment shifts will continue through O2, and we can expect 5 times / month while in the science run.