What is "an acceptable amount of time"?

My answer is simple- driving is about waiting, they can wait, forever if needed.
Example- here in town there is a 25mph 2 lane road that runs through town, about 4 miles with on street parking on both sides. I drive my car no faster than 19 mph on it. No exceptions. People sit back there and stack up, somtimes several deep. Too bad. 25 mph is the speed limit, not the required speed.
I ride my bike on the same road in the 24-25 mph range.
Example- when stopped waiting for trafic to clear to turn left, I feel no guilt whatsoever, they wait, that's the way it is.

Driving is about waiting, that's why cars have comfy chairs, radio, tv, internet, and so forth.