Distance is a scheduling question, not a map question
The distance itself rarely matters. What matters is whether attending your site is a detour or part of a route somebody already drives. A provider with existing commitments in the area absorbs your premises into an established pattern. A provider making a special trip has a fixed cost attached to every visit, which shows up eventually as pressure to shorten the attendance or consolidate the schedule.
Ask directly what else the provider services nearby. You are not asking for client names and should not expect them. A general answer about the areas they cover regularly is enough to tell you whether your premises would be an outlier. If it would be, that is not fatal, but you should understand it before signing rather than inferring it from a pattern of late arrivals.
