The two attached histograms show the relock times for LIGO Hanford during the whole of O4a.

The average relock time has been 2 hours and 55 minutes, while the median was at 1 hour and 33 minutes.

The relock time was computed as the time for which the ISC_LOCK_N value was consecutively below 580.

The 580 value corresponds to inject squeezing, which is why there were some short "relocks" when we used below 600 for the lockloss threshold, because the squeezer unlocked and relocked automatically.

Link to the github repository with the employed code and data