You will strugle with patios/drives to get a decent price. It takes me 1 hour cleaning, 30mins gassing and drinking tea, to clean an average through lounge (in and out in around 2 hours). £50/60/70 see you later! (more for you i am sure)
However an average 300 sq foot drive/patio, i spray with cleaner and scrub with brush while i am talking to them, then presure clean with TM in and out in 1.5 hours. Struggle to get more then £40/50 for clean and maybe a few extras ie. protect, but this can only be done when dry so furhter visit later, total job £60/70. However when the weather is like it was today, cleaning bird s*&%t and moss off a patio or drive is heaven to me. 4 presure wash jobs tommorow, total £240.00 all drives, none of them will be in . I will be home by 2pm, dirty, smelling and very happy.