Remind me never to do any work for you
Sorry, but if I've been in the motor trade long enough to know that deadlines are virtually impossible to stick to. So many factors can prevent this from happening.
Snapped bolts, seized parts, incorrect fitting parts, wrong parts, fabrication, fault finding, added extra 'just jobs', previous bodges, paint reactions, unavavilable parts, slow deliverys, customer telephone calls, customer visits, family emergencies, none of these can ever be factored in to an estimated completeion time.
Many times I've heard people say, "It's got to go out today, so that will do"....