I wonder how long that would take with a single toon, if you're going to be transferring it anyway, no reason not to, but how many days of hitting all 25 dailies (say molten front and tol barad for the last few) would it take for a single character to level a guild from 1 to 2. Might even be possible on a lower level toon with a holiday, but probably not with a bank alt, but really low level characters aren't eligible for transfer anyway.

I happen to have my own guild and in the past 2-3 weeks I have been able to earn approximately 5M Guild XP. I do as many TB dailies as possible; they earn the most guild XP followed by cooking and fishing dailies in capital cities. Molten Front dailies also contribute a bit but I'm more interested in doing mount- and pet-related dailies so I don't always get to those. The only non-daily stuff I've done has been running 2s with a IRL friend that joined my guild b/c he has nothing better to do. Trying to level your guild like this is going to be near impossible; by the time you do it you can level a whole new toon and, with careful attention to the AH, regain much of your gold. Cheaper to move multiple alts if they are above 80.

If you have plenty of gold you're trying to move (ie close to cap), it might be worth paying people to do the 7 dungeons as guild challenges each week. You can make about 2.1 mil XP for these each week. My level 12 guild (purchased from a defunct group) is about 25M XP from leveling. It's gonna be awhile, but I plan to begin recruiting as the patch approaches.