This is something Ive been doing for a week or so now and seems to be working nicely.
Got the idea from my motor trade background where the service department has a manufacturers book with times for every car repair job in it (computerised these days) e.g. replace clutch on a Toyota Corolla may be 6 hours labour so thats what they charge the customer 6 hours @ £85 = £510 .... if the mechanic does it in 5 hours they still charge for the 6 hours and the mechanic gets an hours worth of bonus and the garage make a bit more profit.
so what Ive been doing is pulling up to a job, get hose set up and start the stopwatch on my watch ... if the house is £10 then that gives me 20 minutes to do clean and put stuff away and write ticket / collect payment.
Some of my stuff is ok timewise but have exposed a few jobs where not hitting the 50p a minute so have put them up accordingly .... few surprises cos some houses thought was priced ok were well out and some big stuff quicker than what I thought.
50p a minute = £30 and hour which is a level I want to achieve. ( prob nearer £25 ?? when taking travel time in to account but works well on compact stuff and may start to factor travel time into some stuff ?? dont know yet ??)
Nice when you have a £15 job which would "allow" 30 minutes and Ive managed it in under 20 minutes so like the fast mechanic thats my bonus.
Try it next time your out and see your round in a new light