I'm planning to brew the Winter Wassail from The Homebrewer's Garden. The recipe calls for adding 4 pounds of mashed cranberries and 2 pounds of ground apples at flameout, steeping them for 15-20 minutes, cooling, and then putting the wort and fruit together into the fermenter. The recipe also calls for racking the beer off the fruit into a carboy after 2-4 weeks in the primary.
I've had success with leaving simpler recipes in the primary for extra time instead of transferring it to a secondary. This will be my first time working with fruit, though. Are there any hazards to leaving the beer on the fruit in the primary for an extra week or 2 (or maybe more)?