It can take a year or two but not in the end of his second term.
I don't want to go back in this same situation in the next election where there will be outrageous cheating and the threat of a socialist takeover. Make sure only patriots run any sort of office by then.
I don't think it's possible to drain the entire swamp in 4 more years. It's deep and not easy to get rid of. It's not like Trump can simply fire every swamp member, because it goes into our politicians, media, etc.