My pick has always been around late Jan-March 2019.
As the long term effects of syphilis have kicked in, mango mussolini is in cognitive decline and has to have military minders to keep him from open fires and electrical outlets and fux news. The few, but hopefully enough GOP members of congress with a moral compass and country first will start to peel off during their re-election bids through 2018 by distancing themselves from the unstable petulant man-baby.
Get enough of them plus the D's and you "might" have enough votes for articles of impeachment....and that would occur then soon after inauguration of the new congress in early 2019. It would help if Paul Ryan would DIAF and McTurtle would get lost in his shell....but they're both heartless human beings so the only way they'll support impeachment is if they see their own careers in jeopardy naturally.
Of course the question of whether western civilization/democracy will be functioning at that point is the big one.
People are assholes because half the people around are of below average intelligence - Shunned
I hope I didn't infer that I was antifingerbanging. Its an art I hold dear. - RT