L visa when one has just been in the United States on an H1B:

The time spent in the US working for a company "stops the clock" for the purpose of the 1-year work requirement for Ls.

9 FAM 41.54 N11.3 Time in United States for Foreign Employer or Brief Business/Pleasure Trips Not To Interrupt Continuity of Employment Abroad

(TL:VISA-73; 02-05-1993)

Periods spent in the United States in any authorized capacity on behalf of the foreign employer or a parent, branch, affiliate, or subsidiary thereof, and brief trips to the United States for business or pleasure, do not interrupt the continuity of the one year of continuous employment abroad for L-1 status, but do not count toward fulfillment of that requirement. Such periods spent in the United States may follow the year of employment abroad and immediately precede application for L-1 status, so long as the required one-year of qualifying employment during the past three years has been served abroad.