Lots of these threads come up on TBN about how to charge. And IMO, charging by the hour isnt the best way. ITs fine to have a target, or a $$ per hour number YOU want to achieve, and use that number to factor your price, but I never clue the customer in on this number. First, they will always ask, "how long do you think it will take?" and heaven for bid you go over a bit. And second, cause for most working folk making ~$15-$25 per hour at their "day job" just seem to think that $40 or $50 per hour is obsurd. And third, cause they dont know you or your equipment. If you bid a 10 acre job at $40 per hour, and someone else bids it at $60 per hour but are running a 60HP tractor with a 8' cutter, who do you think is going to get the job? likely you cause you "appear" cheaper. But in reality, the $60 per hour guy could do it cheaper cause he would get done twice as fast.
So whenever I price a job, It is by the job. Just too many variables. Property condition, how dense, obsticals, location, etc. All play a role in how I figure my price. But I do put in my ad that prices are typically between $35 and $50 per acre, and minimums apply. But ultimately, I shoot for $50 per hour from the time I leave my house till the time I am back to my house.
So obviously the guy that is 5 miles away, and has 10 acres of wide open pasture that is smooth and I can go fast, is closer to or under the $35 per acre mark. But the guy an hour away, and only wanting 2 acres done, and is overgrown saplings and briar patches, with lots of obsticals...well he pays more per acre. Likely under a minimum charge. I would figure a few hours to do the job, and a few hours of travel, and just quote him $200. Take it or leave it.