The Employment Authorization document is valid for two years and may be renewed. There is no limit on the nature of the authorized employment. The USCIS refers to this as 'open market' employment authorization. Time in the U.S. on L-2 visa will not count against the six years the law allows the applicant to work in the U.S. on H-1B visa. The USCIS approves H-1B status for professional workers in up to three year intervals. If the applicant was unemployed or out of status between H-1B jobs, the USCIS would count that time. The applicant can apply for Adjustment of Status. Form I-485 Application to Register Permanent  Residence or Adjust Status must be filed with the USCIS. There is no need to apply for Advance Parole if the L-2 visa holder wishes to travel internationally. This is true as long as nonimmigrant status is maintained. If the applicants spouse qualifies for L-1 status, they can apply for a change of status from H-4 to L-2 status and the spouse from H-1B to L-1 status. To obtain work authorization, submit Form I-765, Application for Employment Authorization, together with Form I-539, Application for Change or Extension of Status.