I seriously don’t get why people keep saying this, as though it’s some kind of unique situation.
If you hire a cleaning person for your appartment, they don’t say, “Hey, if I clean your place, that means I need to come over to that part of town, and that’s gonna take up my whole day! So I’m gonna charge you for 8 hours of work.”
Yeah, no. You pay them for the time they are there, and it’s kind of up to them to schedule stuff so they aren’t screwing themselves over.
Likewise, for things like contract work for other industries, if I need to go to a site, they pay for my travel time… but it doesn’t just get rolled into some abstract increased value of my hourly rate. That’d be nuts.