Hi Julian
as your just converting over,you may find that your daily numbers will actually fall for a while,but within a month or two you will be back up to where you were
I think the question may be too broad based for a definative answer(water carraige,compaction of round etc..) but I have a couple of guys who are quick and thorough and they hit good numbers of between 20 - 30 per day(driving distances included)
This also allows them time to get in a conny roof or a bit of fascia cleaning etc..
Whilst im not calling in to doubt your work ethic,one recent convert I spoke to(27 yrs trad!!) said that he felt as if he had to re-learn his entire round to allow for getting all the frames done as well and it took him ages to get used to working with a pole
Perhaps just concentrating on the quality of the finish when you get your setup will be paramount rather than numbers in the early days?
Hope that helps
Good luck- Roy 
Hi Roy, im Julians Business partner
We were talking the other day about this, and feel that it will be like going back to day one window cleaning, as at the moment we have a nice set up (7 years in the making), we know where to park van, we know where the ladder has to go, and all the other small details about our customers houses and whats involved in cleaning the windows on any particular job.
We clean all the frames every time any way so this shouldnt add much time to a clean but we understand that from the moment we turn up we dont know how it works, ie, where to park, any obstacles, how much hose to unwind etc etc.
Then not only that as the round is set up for trad this may also not be practical for WFP, as eventually when we do speed up we will have to condense work down to make the days bigger there again is an issue as we will have to re write all our work sheets. LOL
The feeling is its a massive task but one we want to get right straight from the off, but there will always be something that trips us up. We just want to cover all bases and have solutions for potential problems.
Julian has knocked up a WFP round with our current customer base but we just want to be sure that its achievable, based on what others do as a base for our figures. Merely as a loose guide i suppose.
Andy