H1B validity calculation

[sunshineeast]

Hi,

Need a help on this H1B valid period calculation

• My First L1B, 3 trips, total stay 19 months, then expired.
  
• My Second Fresh L1B, 4 trips, total stay is 19 months and valid till April 2014.
  
• Still on L1 status now in US and also got an approved (unused) H1B in hand valid till Sep-2015.
  

Question:

1) If I jump to this H1B job now, how much is going to be my actual H1B period. ?

2) Am I eligible for H1B extension after sep-2015?

3) When I'm eligible to start GC Process if change my status to H1b?

Thanks in advance

[sk.january]

Were you out of US for 1 year between the fist L1 and the 2nd L1.

If yes, you can only look at the new L1 duration while calculating the 6 year limit(L1+H1)

If not, your first L1 duration also adds up to the 6 year limit.