Here are bus timings from Hyderabad to Chennai Bus by private buses:
Orange Tours Travels
Volvo A/C Multi Axle Semi Sleeper (2+2)
22:30
10:00
Kaveri Travels
Volvo A/C Multi Axle Sleeper(2+1)
21:30
09:30
Kesineni Travels
Volvo A/C -Multi Axle Semi sleeper (2+2)
22:30
10:00