Done a calculation at 57ft to the top frame from the ground on the right hand side of photo.
So?
Told ya 
That's the difference between me and a experienced professional! 
That's what my previous worker was good at when pricing the pressure washing jobs, I'd be out with the tape measure 10 mins later I would calculate £5.00 more than he estimated. All those fivers add up though 
Now 5 flats on each floor with the higher side (out of view to left of building) only having a couple of windows and the other out of sight having the same as what you can see on the left. What's the estimated price for a factor.
All sensible answers appreciated as this is something I haven't approached before.
Lol. Glad you took that the way I meant it.
I don't like talking prices on the forum tbh. It's incendiary either way.
And even talking time, it's very difficult to tell you how long it'd take you.
I know how long it'd take me, but that has no bearing on you.
I'm happy to have a chat with you if that'd help bud.
My number is on my website.
If you don't want to, no worries.
All the best either way.