I am arriving Hnd 14:50 on a Saturday afternoon late March so likely to be busy at the airport (Cherry Blossom peak season.) I was advised by JAL call centre agent to allow 3 hours to connect comfortably (unless you have Japanese passport so immigration queue is minimal) to T1 for Fukuoka flight. I would prefer to have a drink in the lounge (Oneworld rule applies for access) in T1 and not risk my blood pressure rushing around the airport to catch a tight connection! It will also avoid the hassle of missing a short connection then having to queue to rebook on next flight which may be full or have poor seats left.