回复：h1 to h4 to h1

When you transfer back to H1 from H4, you are not subject to H1 quote. However, the time for your new H1 is limited as:
time of 1st H1 + time of H4 + time of 2nd H1=max. 6 yr

Unless you apply for GC, then you can extend your 7th yr H1 if you meet the certain conditions.