The time was only specified as a 'convenyent hower', although to break one's fast after devotions was the generally recommended procedure.
Earlier reference to breakfast sometimes meant dinner, literally, in these cases, the first meal of the day.
Meals tended over time to be eaten later and later in the day: by the eighteenth century, dinner was eaten at about PM...
By the early nineteenth century, lunch, what Palmer in Moveable Feasts calls "the furtive snack," had become a sit-down meal at the dning table in the middle of the day.
69-70) Medieval era "..were the mealtimes and how often did people eat a day?