Probably fairly early, the habits of Hobbits are much like that of the old-time farmers or ranchers (which most hobbits were), they would get up, have a light meal, go out a work for awhile, have another meal, go out a work for awhile, have Lunch, go out a work, have supper, do household chores or lighter work, have dinner, relax, maybe have a before-bed snack, go to sleep. This meal pattern is actually very healthy and beneficial.
Hobbits are by no means, as a race, lazy. They are farmers, herdsmen, shopkeepers, tradesmen, etc.