In my arsenal, for 7-weekers, are:
Plan B Collective Black Indica
BOG Bogglegum
BOG SourBubble
IR's NorCal Daddy's Girl

7 week strains are definitely out there; it is just a matter of browsing through breeder descriptions. One very comprehensive list that shows finish times all on one page can be found here: Sacred Seed - Exotic Seed and Houseplant Shop - Toronto Ontario Canada - Medicinal and Rare Species - Cannabis Sativa / Indica Medical Marijuana / Marihuana / Hemp Seeds Breeders Strains List
This isn't a plug for the business, as they do not ship; their website is simply very easy to use as a strain info reference.