How many years of training is required to become a cabin crew?

You generally require minimum one year of training for the same.

Air Hostess/ Cabin Crew Courses is a 1 year course.

Budding cabin crew could undertake a full or part time college course, such as the Level 2 Certificate in Air Cabin Crew. The apprenticeship route will usually take around 12 months to complete. Aspiring cabin crew can apply directly to their preferred airline.