If you are talking about Fleet Common training, aka “Indoc”, it is two weeks. Or more specifically, 9 business days.

Fleet specific training (type rating) sims starts NET 1 week later to allow for academic study, and is 4 weeks long. Any break in training over 48 hours gets a company business (paid) ticket home. You have to have 2 days in any rolling 7 days off. That almost always comes as a 5-day “week”, but that’s not guaranteed.