Calculation of interest u/s 244a after appeal effect

An order u/s 143(3) was passed on 25/12/2017 raising a demand of Rs. 53,12,950/-. An amount of Rs.10,65,000/- was paid on 06/01/2018 and an appeal was filed. Further appeal was allowed and after appeal effect on 17/06/2020 demand became NIL and a refund of Rs 10,65,000/- was arised. What should be the actual interest u/s 244a for this refund?