Everyone is different but this is how my son builds up for a season.
First we always shut down for 10-12 weeks of active rest. Coming off his rest period he starts to long toss 2-3 days per week, starting easy and slowly working up to maximum throws. After a week or two his LT ends with some flat ground “pitching” at 60-70 feet.
We will start to add in a bullpen after a couple of weeks, again not at 100% just getting a feel for his mechanics.
After 3 weeks he will start to add in a day or two more of LT as his arm strength comes up he focuses more on the “pulldown” part of LT. We will start adding in bullpen sessions depending on how he feels. After 4-6 weeks he will be on a daily LT routine, start to do more bull pens and then he is game ready. All first games are FB only and 2 maybe 3 innings. After a few games he will add in his CU and then finally his CB. Early games are 3 innings max.
After 8-10 weeks the coach starts to allow him to stretch out his innings, up to 75 pitches. By now he is long tossing nearly everyday, generally lightly the day after pitching. Once he is feeling good and we are starting to get ready for league play he will be allowed to stretch out to a full game. Generally 80-90 pitches or so. Once we are in league he will complete a game up to 100 pitches plus or minus a few. One game last year he went out to 110 pitches.
He is on a constant LT routine, doing his band work daily, stretching, and stretching with a partner prior to his starts and always running after pitching. Once he is at this point the limitations are artificial. After his 110 pitch game he said he felt like he could pitch 2-3 more innings.
He is very diligent with his warm ups, he always runs to get a sweat; he always does a full set of arm circles, always bands, always stretches, and always long tosses prior to his starts. He is fortunate to have a buddy on his team who has done the full Jaeger course with him several times so he has someone to work with. They are the only two pitchers on the team (IMO) who prepare properly.