Throw in violation

[Pwhitt]

What is the actual rule describing how long a player inbounding a ball has to enter the court after releasing a pass? Our team was called for a "floating" violation Friday night late in a 2-point game because my inbounded hesitated after inbounding along the baseline, pausing, and sprinting to the opposite corner. On tape he took 1 second, possibly 2 max, to enter the court.

Does anyone know where this is in the HS rule book?

Thanks.