We're very lucky - we have two routes that provide a 15 minute interval service into the centre of Birmingham, the fast one takes about 20 minutes, the slow one about 30 minutes. They are scaled back to hourly in the evenings after around 19:00, and go through to midnight. more or less.
The other way, we have a 20 minute interval fast service into Sutton Coldfield which takes about 8 minutes, alternatively it's a quarter-hourly slower service via the local estate which takes around 18 minutes. There's also two or three services run by independent operators into Sutton, but they are at best hourly.
Finally, there's a 20 minute frequency service to Solihull, but it goes all-over the place and you'd be quicker walking ....