what colour is the car now?
If it's completely different to the colour you want it painted, the car will need EVERYTHING removed to respray it - engine and ancillaries, interior, head lining etc etc. You're looking at at least a week to strip and prep a car for paint. Painting is the easy bit. You've then got 1-2 days to rub back and polish the paint if you want a good finish.
How much do you think upto 2 weeks work should cost?...now add the cost of the paint. Less than £1,500 and you should know you're guy is massively cutting corners...which results in a crap finish.