What are the TIME limits for wave-b of a Flat?

ANSWER:

Wave-b in a Flat will normally take 2-4 times longer than wave-a. There is no absolute maximum time limit, but if beyond 5-7 times that of wave-a, it becomes suspicious. The most important thing to remember is that if wave-b is substantially more time consuming than wave-a, then wave-c must be approximately half of the time of waves-a & b combined.