Apparently I live in a real poor people's area here. So far, no one here has had their garden completed by a landscaper. Everyone always only has driveway, terrace, spray protection, (slope) reinforcement. Vegetation all done by themselves except for a few rolls of turf.
I, for example, would not have plants done by the landscaper, I want to do that myself. Sure, I would also have L stones and basic slope reinforcement done, but the rest then piece by piece myself.
I don't have the problem that I absolutely want to do the plants myself, but the slope reinforcement including angle stones financially forces me to do it. ;)
Small provider ... fiddles around repeatedly for 3 months.
Large provider 1 week 5 men and done.
That's the experience here.
We have a small one. He has been fiddling around here for 1 month so far.
However, I cannot infer from my anecdotal experiential knowledge from neighborhood observations that the work speed scales with the number of employees. The larger landscaping companies with 5 employees on site have rather distinguished themselves by their breaks.
1 FTE is sitting in the mini excavator waiting for the next
1 FTE is sitting in the wheel loader waiting for the next
1 FTE is giving instructions and waiting for the next
1 FTE is currently on a breakfast break
1 FTE is currently not finding his shovel