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but will have to start doing is double the labour rate for the first hour
At least. The telecoms company I used to work for would have a much higher rate for the first hour, then lower for 2nd and subsequent. Followed by a slightly reduced rate for half Day (4 hours) and again for full day (8 hours).
Meant punching down a cat 5 cable could cost a customer what they considered a ridiculous amount, but we had to cover the engineer's time and travel going to and from site. Obviously B2B is not directly comparable to what is being discussed here, but the principles work out.
Doesn't work that way, some of the sundries (repaircare epoxy resin) are too expensive to include in the labour rate and it would mean the 1 hour jobs I do on the bike are also paying to run the van.
Another thing I've never done but will have to start doing is double the labour rate for the first hour. I can't do 8 hours of 1 hour jobs in a day if I'm going on the time I arrive on site.
Your final point, yes, a lot of people will be using materials they know and trust. Nothing worse than getting crappy materials that slow you down or mess your s**t up.
The bike shop analogy is fine.