Here is an interesting article about this subject, suggesting a 400m-rule for walking distance to the next stop: https://humantransit.org/2010/11/san-francisco-a-rational-st...

The city of Zurich, Switzerland recommends a tram stop every 300m-600m: https://www.stadt-zuerich.ch/content/dam/stzh/vbz/Deutsch/Ue... (page 19)