You can allow users to list by a unit of measurement instead of quantity. You may want to allow a listing by acre or mile. To edit this go to
Admin Dash > Manage> Service Types> Edit and scroll down to
Enable Per Unit Pricing
Enable per Unit Pricing option and then also ensure that the
Schedule Booking is turned on under
Calendar. You may also want to turn off the hourly, daily, etc. pricing options.
Once this is turned on you will see the
Number of Units tag show up on the new listing page.
You can change the text
Number of Units by editing the translation key