Overblocking
While the long duty over an area where extra vigilance is required should not be done with the 3rd pilot in seat 1K, this is a legal pairing.
What is not legal is the fact that the block time is based on a 'as the crow flies' calculation done by commercial department and you will find at least 3 90-degree turns in the actual flight path that is at least an hour over the summer block and even with the increased winter block it will be impossible to complete in the time allowed on most days.