Regarding an funding application to the Culture of Solidarity Fund here their answer for the timeframe for projects:
European Cultural Foundation
We have no strict limitations regarding project timelines. As for starting date, activities within the frames of the project proposals may start prior to the submission deadline (27 April), but we can only consider projects that are still ongoing at the time of the selection of awarded proposals (31 May). Projects may also continue into 2021, in fact, the complete timeline of the project may be up to 24 months.