Apologies if this is no help, but in case you didn't know, you don't actually have to stay as that job while you wait. You can change to something else (gatherer, crafter, whatever). Then when you get the notification you have those 45 seconds to change back.

Unfortunately it does mean you can't join any sort of party though, including bringing out you own chocobo as that'll cancel you from the duty finder.

Like I said sorry if that's no help, but thought best mention in case you don't as it might prove useful.