I also had the problem of job constraints but you could choose a weekend day or early evening (or any other block of a couple of hours) when you would install the trap and keep an eye on it. You’d have to remove the trap if you don’t have success in the given block of time, but I had success after just one hour. (If you’re not familiar with the inbox trap, it’s not meant to be installed permanently — in fact it can’t be. So putting in the box and removing it is really very simple.) Good luck!