There is NO mandatory training time in between belt levels. However, see below for the typical training times for each belt level.
White Belt – 3 months
High White Belt – 3 months
Yellow Belt – 3 months
High Yellow Belt – 3 months
Green Belt – 4 months
High Green Belt – 4 months
Blue Belt – 4 months
High Blue Belt – 4 months
Red Belt – 6 months
High Red Belt – 6 months