My uncle is in the Dayton golf HOF. When I played in school he pushed me to break the game down into smaller goals that went like this:
In 9 holes shoot for 5 GIR. Birdie one of those holes. Of the 4 you miss, get up and down on two of them. That leaves you one over for 9 holes and takes the pressure off of thinking you need to par every hole and/or hit every green. Rinse and repeat. Depending on what par is you are scoring between 72/74. That also equates to 30 putts/round, which on a course like the South course or equivalent TPC is pretty good putting with no tolerance for 3 putting.
As far as practice, 60/90 minutes every evening on the NCR practice putting green which is huge and can simulate the tough long putts on the course.
We could move this discussion to OTJ.