well mate i would do it on my own as fast (doing a good jod of course)as posible if it took a day fantastic bring out the champain 2 days great 3 days i would be pleased 4 days ok...... you get the idea
i priced it quickly on a calculator fist time so it wasn't quet right. here is how i would price it up properly.
Ground 190 @ 50p =£95
First 87 @ 60p= £52.20
second 207 @ 80p= £165.60
third 64 @ £1 = £64
fourth 30@ £2 = £60
fith 12@ £3 = £38
Sub-Total=£474.80 Round up to £480
Sorry didnt notice internal before
and internal 52@£1=52
Grand total= £532 Round up to £550
That is how i would do it, however easyclean will have more experience on big jobs, my biggest job only takes two hours. I would say to remember that your gonna have to think about how much water you will need, how long it takes you to refill, can you refill on site. parking, traffic will it be better to clean at certain times of the day? etc like easy clean says dont price too low as you will regret it but if you price too high and dont get it youv lost nothing. Hope this helps