My American wheat ales, 1 w/ 9# DME, the other with 6# DME are still bubbling away at about the same rate, and about the same time frame (2 weeks).
As I'm heading on vacation Wednesday, they'll be in the fermentors for another week, and bottled on 8/29. (Took the day off, so bottling is as good a use as any).
I've found that my wheat ales all start off strong, and take longer to finish than my pale ales. YMMV.