What is the expiation for stoning the Jamarat for two days without haste, and stoning during the day, and not spending the night in Mina during the days of Tashreeq, knowing that some of the rulings were unknown? Is one expiation required or multiple expiations?

If you stoned before the time of Dhuhr, this is an error, because the most authoritative opinion is that stoning on the days of Tashreeq should only occur after zawal (midday). If you left the stoning of the third day and did not depart early, you have abandoned two obligations of Hajj: the stoning of the Jamarat (definition) and leaving the overnight stay in Mina. Whoever abandons an obligation of Hajj must offer a dam (sacrifice) to be slaughtered in Mecca and distributed to the poor of the Haram (definition), and whoever is unable to do so must fast for ten days. Therefore, whoever abandons the stoning, or part of it, and abandons the overnight stay, owes two dams. If they are unable to offer them, then for each one they must fast for ten days. This applies equally to one who did it intentionally, one who forgot, one who knew, and one who was ignorant.