From personal experience I could easily believe the time taken, last minute change of route requiring busy ops office to add sending new plogs to where ever required add in printer problems meaning someone has to find a printer that works before it finally gets on-board and fuel figures get checked. A bad day at the office can become a major delay before you know it, and that's before you ask for more fuel only to be told it will be a couple of hours because you are now off schedule.