They challenge you to hasten the punishment (with which they are threatened by God). Surely Hell will encompass the unbelievers (with the reasons for them to enter it, and is bound to have them in it)
They keep asking you to hasten the requital, but verily, Hell surrounds the rejecters of the Truth every moment of their lives. ((79:36), (82:16). And every action is getting instantly imprinted on each "Self")