I've posted a note in the DCC with some information about our duty cycle durring ER7, and some of the causes of downtime.
https://dcc.ligo.org/DocDB/0120/T1500368/001/ER7DutyCycleNote.pdf
I will possibly update this with more information about DRMI locking durring high winds and when it is and is not necessary to wait for bounce and roll modes to ring down in the coming days.