25 hours. Not sectors.
Some people would have come to their first jet from light pistons, and others from turboprops. We do the same training. I’m not sure how many landings or sectors are required, but am absolutely positive on the hour requirement.
After your first 25ish hours, your line training is considered complete (as long as you’re demonstrating competency, of course). You’re then release to fly with regular line captains, with a few restrictions on crosswinds and contaminated runways etc, until you get to 100hrs on type. After 100hrs, you’re unrestricted.
Of course, a great deal of mentoring goes on in those first few hundred hours. You really learn how to fly from the line captains.