The Republican base still completely supports trump so any GOP senator voting to convict trump puts themself at risk of losing their next election. Senators may hate him but they love power more, they will not cast a vote that may throw themselves out of office.

At most you will get 5 GOP senators to convict him, then what. The motion fails and nothing happens other than wasted time. Trump will lose zero support from his base since they dont really have many values and morals to begin with.

At best, cap the trial to 3 days and mornings only. Limit the wasted time, and start getting bills written and voted on. America needs more help to fight covid and stimulate the economy.