That's about right. 30 foot is roughly 10 meters.
All W/C's over here, without exception, price on square meters, ladder work, cherry picker & access. In all my years, my etimates are rarely more than 5% out (faster/slower) The reason I've sub'd this out, is because, I can earn the same money working on other jobs without ladders. Given the choice, everbody would do the same.
The last window cleaner measured the job and the custy is paying 1,35 €uro's plus VAT per square meter. Let's say the front is only 20 feet (it's not) but who cares?
All I wanted to know was, how long it would take a WFP guy to clean it.