Do Piper or Cessna publish estimates for maintenance work, that repair
shops use for charging or estimating?

In Europe, many car manufacturers use estimates like this for car
repairs and maintenance work. Say the manufacturer specifies 45 min
for an oil change. That is what you are charged for, whether the
change takes them 20 min because they work fast, or 1.5hrs because the
filter broke off when they were removing it.

If this doesn't exist, how does one estimate aircraft routine
maintenance (like 100hr inspections) or repair (like replacing a
vacuum pump)?