My trip in May may consist of a T2B/T2F-T2A connection at CDG with 8 hours apart. I'm wondering if I can checkin my luggage at 08hrs for a 16hrs flight or am i better off with a locker?.... I'd be flying J connecting to JL F in London, FWIW (I assume it'd be through checked).

Also, how long should it take T5-T3 in FCC, and will there be fast track?