Based on
http://www.uscis.gov/propub/ProPubVAP.jsp?dockey=dea95cea8377fac5a0ee250c6920c6be
Note: As stated elsewhere in the AFM , while extension for a period beyond the alien’s 6th year may only be granted in one-year increments, such extensions may – in certain cases – be combined with earlier extension requests provided the above criteria and all eligibility criteria are met. The total maximum grant for any H-1B extension request is 3 years. Thus, for example, a single H-1B petition and request for extension may be filed combining a request to extend the alien’s H-1B status for years 5 and 6, and also for year 7. See separate AC21 memos for additional guidance.
, it seems that I could do "one year + leftover"? But I am not quite sure that I am reading the relevant documents.
Thank you,
lovepeople