I already answered that there is no time limit. (check the chain above).
(C) Calculating the maximum H-1B admission period. Time spent physically outside the United States exceeding 24 hours by an alien during the validity of an H-1B petition that was approved on the alien’s behalf shall not be considered for purposes of calculating the alien’s total period of authorized admission under section 214(g)(4) of the Act, regardless of whether such time meaningfully interrupts the alien’s stay in H-1B status and the reason for the alien’s absence. Accordingly, such remaining time may be recaptured in a subsequent H-1B petition on behalf of the alien, at any time before the alien uses the full period of H-1B admission described in section 214(g)(4) of the Act.