This was in practice at some time between midday and 3.00 p.m.
The evening meal had to be a reasonable time after this, at or after vespers (around sunset).
69-70) Medieval era "..were the mealtimes and how often did people eat a day?
Upper-class people were eating breakfast earlier, and dinner later, than they had formerly done..1808...dinner was now a late meal and supper a snack taken at the very end of the day before people retired to bed.
For a long time luncheon was a very upper-class habit; ordinarily working people dined in the early evening, and contented themselves as they had done for centuries with a mid-day snack...
Three meals a day were accepted as reasonable by most later sixteenth-century writers, such as Andrew Borde, although he thought that this was only good for the labouring man: anyone else should be content with two.
It has been suggested that breakfast was only eaten by children and workmen, but certainly by the fifteenth century it was quite commonly taken by everyone....although the 1478 household ordinance of Edward IV specified that only residents down to the rank of squires should have breakfast, except by special order...
A number of individuals, usually for religious reasons, chose to have only one meal a day.
There may have been others whose meals were similarly limited from lack of resources, but we do not hear of them." ---A Handbook of Anglo-Saxon Food: Processing and Consumption, Ann Hagen [Anglo Saxon Books:1992] (p.The Regularis Concordia mentions the prandium ad sextam at noon, and a cena between Vespers and Compline allowed daily from Easter until Whitsun.From Whitsun until September 14 (apart from certain fast days which included Wednesdays and Fridays) and on all Sundays and feasts of twelve lessons there were also two meals a day but the prandium was not taken until none (3 p.m.).Edward Prince of Wales (son of Edward IV) probably dined at 11.00 a.m...supped at 5.00 p.m.... Digestion, it was thought, is fortified by movement and the heat of the sun...authors, armed with a purified Galen and other Greek authors, promoted the larger "coena," or supper, at around six in the evening.The staggering of meals in large households, with the servants eating earlier than the lord..common." ---Food and Feast in Medieval England, P. Hammond [Wrens Park Publishing: Pheonix Mill] 1993 (p. They argued that distribution of humors and spirits, the third stage of digestion, is stronger during the day, but concoction is much stronger when the mind and body are at rest...Sir William Harrison thought that in previous times (not specified) there had been four meals eaten a day, that is breakfast, dinner, nuntions (or 'nuncheons', taken about noon) and late supper.