The pricing I was talking about was for clearance only, time wise for a 3 bed semi for what you mentioned above would all depend how dirty everything was. Anything between an hour or two or longer. Pricing would be based on allot of variables for a full FSG and window clean on anything. I wouldn't have a set price , just a prices from as you have to have a good look around a property when it comes to exterior cleaning so you don't get caught out.
I have had in the past folk say oh it's not that bad and I gave a price over the phone and the property was minging and I never made much on any of them as they took ages to do. Windows is one thing but FSG's are something totally different when it comes to pricing them properly and in my opinion should be always done in person.