For the last 6 or 8 months my 2011 with 195K miles cranks 5-10 seconds before catching under certain very specific conditions. It only happens when it's been driven some distance and then parked for an hour or more. The long cranking gets progressively worse, peaking around 4 hours and then tapering off after around 7-8 hours. Hot start fires right up. Cold start fires right up. I haven't noticed much difference related to ambient temperature, but it's been a generally mild winter. It is very consistent. Happens every single time, and it hasn't gotten better or worse since I first experienced it. My local mechanic (not a dealer) found no codes and has no idea. His Hail Mary was injector cleaner, which had no effect.