Might be worth noting, that for a two pilot crew in the UK, reporting for duty at 0500, operating 6 sectors, the maximum Flying Duty Period (FDP) that can be scheduled would be 9 hours, which would give a last “on chocks” time of 1400.

Have a look at http://www.caa.co.uk/docs/33/CAP371.PDF page 21, which is the CAA document which is the basis for UK airlines Flight Time Limitations (FTL) schemes. If, on the day, something goes wrong, that can be extended by a further 3 hours (Commander’s Discretion page 24). A Split Duty (ie taking rest during the day) could enable a longer duty to be scheduled, but the FAA regulations seem lax compared to the UK’s…..comment from WD?