OIT has reoccurring maintenance windows each week. Here is the list of those times and the types of maintenance that might occur during those windows.
Tuesdays from 6:00pm until 11:59pm: maintenance performed during this time has a low risk of impacting service delivery, or affects only a small set of users
Wednesdays from 12:01am until 6:00am: maintenance performed during this time may impact service delivery, or impact is limited
Thursdays from 6:00pm until 11:59pm: maintenance performed during this time has a low risk of impacting service delivery, or affects only a small set of users
Saturdays from 3:00am until 9:00am: maintenance performed during this time has a major risk of impacting service delivery
PeopleSoft maintenance information can be found here: www.ohio.edu/oit/sis/
eBusiness Suite maintenance information can be found here: www.ohio.edu/ebiz/ebiz.html