In NYC, it depends heavily on the bus line. Some stop nearly every block (which can be as little as every 100m) whereas some have more widely-spaced stops.

The buses here are notorious for running very slowly (and thus behind schedule), and one of the proposals to speed some some slow buses is to eliminate stops on lines where they are densely clustered. It's become a subject of considerable debate, as residents and in particular older and disabled people are usually against consolidation, whereas most others accept it as a necessary cost of improving service.

The M14, which runs along 14th Street in Manhattan, is an example of where this is happening right now. Currently, the bus spends around 25% of its time standing in stations because it stops pretty much every block. There's a plan to eliminate some of its stops, but it's unclear whether it will succeed. Here's a good read on the subject: https://nyc.streetsblog.org/2019/04/19/never-stop-stopping-r...