It would be a good idea to keep a nest box in the tractor.
It generally takes about 26 hours to "build" an egg. Therefore, the hen will lay the next egg about 2 hours later in the day, the following day. (If she's a daily layer.) The next one will be an hour or two later the NEXT day, and so on, until it's too late for her to lay that day. Then she'll start over again, or skip a day or so.