Kopech has 126 IP today. He has probably 6 starts left in the season, assuming he goes every 5th turn, and not every 5th day. Even if he averages 5 IP in those starts, you are looking at 155 IP essentially. Another 26 IP next year is another half inning per start on average. As you can see with Kopech, as the season has gone on, the number of innings he has gone, has been going up. Post ASB he is averaging 6 1/3 per start, and 6 2/3 in his 3 August starts.
I feel like 180 is a pretty comfortable number for next season.