CraXor's training method
What you need to optimize foal's playing :
salt stone
carrots
turnips
pasture very clean
temperature over 10°C (to put foal in pasture during night)

8 MONTHS :
1h30 pasture / salt stone / grooming / 7h playing / turnip / 1h playing / stroking / Carrot / Drinking / 2h pasture / Feeding
10 MONTHS :
1h30 pasture / salt stone / grooming / 1h playing / 1h pasture / 1h playing / turnip / Feeding (min 7 pounds) / 7h playing / stroking / Carrot / Drinking
1 YEAR :
1h30 pasture / salt stone / grooming / 8h playing / Carrot / Drinking / 1h playing /
stroking / turnip / 1h pasture / Feeding (what's needed)
1 YEAR 2 MONTHS :
1h30 pasture / salt stone / grooming / 9h playing / turnip / 1h playing / stroking / Carrot / Drinking / Feeding (min 10 pounds)
1 YEAR 4 MONTHS :
30mn pasture / salt stone / grooming / 1h playing / Feeding / 9h playing / turnip /
1h playing / stroking / Drinking / Carrot
1 YEAR 6 MONTHS :
30mn pasture / salt stone / grooming / 1h playing / Feeding (min 14 pounds) /
10h playing / turnip / Carrot / 2h playing / stroking / Drinking
Summary of playing durations :
8 months : 8h
10 months : 9h
1 year : 9h
1 year 2 months : 10h
1 year 4 months : 11h
1 year 6 months : 13h
It is possible to use this method with temperature over 6°C (putting foal to bed in pasture) => but you will have to feed him more.
Do not let your foal be too overweight!
You might have to put your foal to diet after the end of game period.
When temperature is less than 6°C, you will lose playing duration…
It's your choice :
either wait for temperature to raise,
or play all the same (but less hours of playing and less PG gain with games…)