How many years I can stay in USA without GC for the below case?

Please help me to clarify the below.

 

My current H1 visa is valid until September 2015. I want to know how many years I can continuously stay in USA without filing the GC and applying only with extensions.

 

I have made the below US travels and I'm in an assumption that my 6 years clock got reset between trip 3 & trip 4. I'm assuming I can stay around 3 and half years, but some of my co-workers telling clock reset may not apply if you are on the same petition even though we have 1 year gap. Please clarify me on this.

 

trip1. 3 months 17-Feb-07 15-May-07 B1

trip2. 3 months 30-Jun-07 29-Sep-07 B1

trip3. 11 months 13-Jan-08 14-Dec08 L1 P#wac0105851548

 

---------------15 months stayed in india--------------------

 

trip4. 11 months 14-Mar-10 14-Feb-11 L1 travelled with old L1 visa(P#wac0105851548) which expired 03 dec 2010 and filed extention upto 03 dec 2012 (new P#eac1104050681)

trip5. 2 months 23-May-11 14-Jul-11 L1 P#eac1104050681

trip6. 3 months 11-Feb-12 29-Apr-12 L1 P#eac1104050681

trip7. 12 months 20-May-12 STILL IN USA Entered with L1 .Converted L1 to H1 on 12/26/2012 travelled with L1 visa(P#eac1104050681) which expired 03 dec 2012 and converted L to H on

12/26/2012 ( new P#eac1304151024).

Your colleagues are right. As you didn’t go for another visa and use old petition/visa, your clock is not reset.