What is the ruling on a pilgrim sitting outside the camp in Mina for less than half the night, and is anything required of him for repeatedly stoning the Jamrat al-Kubra due to doubt?

The majority of scholars hold that the obligatory stay in Mina is achieved if the pilgrim spends most of the night within its boundaries. If your stay in Mina was for more than half the night, then the overnight stay has been fulfilled, and there is nothing upon you. If it was not, then the preponderant opinion is the obligation to give a measure of food (mudd) for each night in which you did not spend most of the night there. If the stay was less than most of the night during all three nights of Tashreeq, then a dam (sacrificial animal) is obligatory upon you, to be slaughtered in Makkah and distributed among its poor, and you may appoint someone to do this on your behalf. Doubt after completing the throwing of the pebbles is not to be considered and has no effect. There was no need to repeat the throwing of Jamrat al-Aqabah, but nothing results from your action.