The SBA trip is run is one, round-trip a day. Overnight in ONT, about a 45min flight eachway. Leave early around 0600-0700, you hangout ALL day in SBA and bring the ATR back to ONT at the end of the business day.
The run could have changed over the years, Empire could now be offering pilots a Hotel in both SBA and ONT nowadays but that’s the basic rundown of the SBA run. Monday through Saturday with the plane staying in SBA over the short weekend.