Here's an example of probably the second best PT system in the UK, Birmingham
From our house, it was half a mile to walk to the nearest bus stop, where I'd wait for up to 15 minutes to get a bus to the Scott Arms. Then I'd have to cross from one side of the Scott's to the other. Then wait for the bus into the city, they are every ten minutes but I'd be playing roulette because only every other bus is a limited stop express service, if the stopper turned up, you'd wait for the express because you still got there quicker. These buses may have a timetable but its just there for effect, you can't guarantee any of the timings
The alternative was hope the first bus was a Hamstead bus and not a Sutton bus, so could be half an hour wait. The Hamstead bus terminates at the other end of the village to the station and it was pretty much guaranteed you'd just missed the previous train so would have to wait half an hour for the next one.
Our house was seven miles from the city centre and I could drive into town in 20 minutes. On PT, I'd have been extremely lucky to do that in under an hour
Amd that is the step down from London. Everywhere else it's most likely worse than that