Recapturing Unused H1B Time
Any time spent outside of the U.S. during the six years of the H1B status may be recaptured to make up the full six years. For example, if the employee spent two months every summer outside of the U.S., s/he would be able to recapture 12 months of H1B, thereby extending his status for an additional year with that unused time. See the following document on how to document your unused H1B time. Recapturing Unused H1B Time