How's this sound to you guys-
$100 mobilization cost- most projects within 15 mile radius of shop, $125 an hour man and machine, half day minimum, so-
$600 for half day, $1100 all day, includes any available attachments not just buckets, everything's on site ready to use. Multi-day projects at reduced rates due to mobilization cost savings, value of staying in one spot.
8 hrs on site is a good long day by the time you load and transport both ways. Doesn't include time to run the business, bid other work, billings, go to the post office, bank, gather supplies and fuel, etc. That usually happens evenings, and short days.
I think you are in the ball park, good luck with your venture.