You're exactly right...if the job should take 2 hours...and by your own innovation you can do it in 30 minutes..you charge for 2 hours..
Now...before the landscapers chime in to complain about unfair labor charges...Isn't the reason you guys spend thousands of dollars on ZTRs and other eqpt...so you can get paid the same amount to do a job...performing it in less than half the time..???
If You Have All The Answers...Except The One You Need...You're Not Trying Hard Enough...
Do The Work