Localiser green, Brittania are a Uk company and so are operating to uk regs, which are considerably differenent from the states.
The length of duty depends upon the time of day you report, and the number of sectors you do, for a 2 sector day is between 10.15 and 13.15 limit.
Of course there are ways to increase this (days off before and after to give specific route alleviations). One example is UK to BJL (the gambia), allows a 14.15 duty (rostered), to do there and back !!