I play evenings & weekends too. Start a race on :00, then divide the hour evenly. Whether it's 2, 3, or 4 races an hour (depending on race total time), you'll see plenty of decent drivers.
Current online events:
DRC Open :00 and :30
Fuji RWD :00 :15 :30 :45
Suzuka FWD :00 :20 :40
HSR AWD can be done every 10, but :00 :12 :24 :36 :48 leaves enough time to allow for messaging in between.