Bava Batra 12 - Partners Divide a Field
How large does a jointly owned field has to be in order for one partner to compel the other to dissolve the partnership? - Each partner must receive at least an area that takes a full day to plow; a field must be at least that large to be cultivated profitably. Oxen had to be rented for a full day even if they were needed for only part of the day. It was thus unprofitable to rent them for less than a full day's work.
After the Temple was destroyed, prophecy was taken from the prophets and given to young children.