Machine size follows access
A narrow gate may rule out the machine that would finish fastest, so a smaller unit and more time may be proposed.
Terrain
Slopes, soft ground after rain, and rocky soil all change the approach.
Nearby structures
Working close to foundations, fences, or hardscaping means slower, more careful grinding.
Not every site works
Some properties cannot accommodate the equipment a stump requires. A contractor will say so during the review.
Services are performed by independent local contractors. Scope, access, scheduling, and pricing are confirmed by the contractor.