Let's begin with the types of practice most common among developing putters: massed practice and repetition. One of the more common complaints that pops up in disc golf's social media outlets are along the lines of: "I've been taking hundreds of putts per day, but ..." Commonly these competitors are chunking their repetitions into massive groups. A new player feels like 15 footers are giving him trouble, and so he repeats those 15 footers for an hour, dropping a couple of hundred putts on the basket from that range until he can mindlessly zip the putter into the basket without thinking about it. By the end of a session the putt feels easy, but when a tournament rolls around the skill seems to wash away like a sand castle at high tide.
There's nothing wrong with taking hundreds of putts per session. But the practice needs to be varied. Evidence shows that repetition from a single range must be interleaved with practice that varies the range. Taking 50-100 putts at a time from a single range before moving to another range is beneficial, but the benefits are stronger when one also implements a routine that involves moving putt by putt closer and further from the basket. Contemplate for a moment what tournament golf is like: a golfer does not often take 18 putts on 18 holes all from 25 feet. The body needs to be able to adjust dynamically up and down from 15 footers out to the limits of range. A recommendation would be to set stations up at varied distances from the basket allowing you to move putt by putt in and out in small increments. When out on the practice green take 50 putts from 18 feet, and then break it up by moving in and out for the next 50 before moving to another set of massed putts from a single distance.
The benefits may not be as obvious: where you were finishing your massed sets at a single range by zinging in putt after putt and feeling confident and successful, you may find yourself missing quite a bit more often as you move up and down your "ladder" of stations. This is not a bad thing, learners often interpret difficult practice as indicative of an unsuccessful day, but that is rarely the case. Difficult practice is more in line with the mental challenges one will encounter on the disc golf course and develops the resilience necessary to maintain focus on the course through a day of competition.