hi, thankyou for all your replies. the thing is that suppose a customer asks me for a custom job, i end up saying "cost/hour: $10, hours required: 10, total: $100". Now the hours required i select is a wild guess on my part to be honest. the problem is how do i accurately set the hours required. then how do i measure it? (i dont want to use a watch while i work). and once i measure it, if its more how do i tell the customer that i should charge him more?