Downtime mode is played day-by-day or with longer time units rather than minute-by-minute or scene-by-scene. Usually this mode of play occurs when you are in the safety of a settlement, maybe recovering from your adventures or studying an alien artifact you found.

Downtime gives you time to rest fully, engage in crafting or a professional endeavor, learn new spells, retrain feats, or just have fun. You can sell items acquired during your adventures, buy new goods, and perform other activities as determined by your feats, your skills, and the settlement where you are spending the downtime.

You can spend an entire day and night resting during downtime to recover extra Hit Points as indicated in damage and healing

Retraining offers a way to alter some of your character choices, which is helpful when you want to take your character in a new direction or change decisions that didn’t meet your expectations. You can retrain feats, skills, and some selectable class features. You can’t retrain your ancestry, heritage, background, class, or ability scores. You can’t perform other downtime activities while retraining.

Retraining usually requires you to spend time learning from a teacher, whether that entails physical training, studying at a library, or similar. Your GM determines whether you can get proper training or whether something can be retrained at all. In some cases, you’ll have to pay your instructor.

Some abilities can be difficult or impossible to retrain.

When retraining, you generally can’t make choices you couldn’t make when you selected the original option. For instance, you can’t exchange a 2nd-level skill feat for a 4th-level one, or for one that requires prerequisites you didn’t meet at the time you took the original feat. If you cease to meet the prerequisites for an ability due to retraining, you can’t use that ability. You might need to retrain several abilities in sequence in order to get all the abilities you want.

Getting professional degree or academic degree counts as training for things below for four different related things/semester(about 120 days). Dedicated training for a single thing requires a month of training on it.

You can spend downtime retraining to swap out one of your feats. Remove the old feat and replace it with another of the same type. For example, you could swap a skill feat for another skill feat, but not for a tech specialization feat.

You can spend downtime retraining to swap out one of your skill increases. Reduce your proficiency rank in the skill losing its increase by one step and increase your proficiency rank in another skill by one step. The new proficiency rank has to be equal to or lower than the proficiency rank you traded away.

Note that if you no longer meet the requirements for a Combat, Biotic, tech specialization or a level of such after skill retraining, you can no longer use that Combat, Biotic, tech specialization or rank of it.

You can spend downtime retraining to swap out one of your specialization increases. Reduce your rank in the power losing its increase by one step and increase your rank in another power of the same type by one step. The new rank has to be equal to or lower than the rank you traded away.

You can spend downtime retraining to swap out one of your exploit. Remove the old exploit and get the new. The new exploit has to be equal to or lower level than the exploit you traded away.

Your expertise and theme are more fundamental to the character basic knowledge. You require a long term training to change one of them. The training takes normally 10 normal training units. At halfway through the training you lose the use of your old abilities and at end you gain the new.