L1B extension how many time can be extended

I have valid L1B visa till oct 2015, i am planning to file extension in oct2015, my visa was extended twice since 2009. My total stay in US is around 24 months. There was also a gap of 1 yr in between. Am i eligible for third time extension?

You can stay a total of 6 years in US… SO count accordingly… You may extend