According to the article How Are Ground Staff and Cabin Crew Jobs Different both ground staff and cabin crew aspirants undergo training that typically lasts 8–12 months depending on the institute or airline/training academy.
For ground staff training includes classroom lessons and practical airport exposure such as check in procedures baggage handling ticketing systems airport operations, and customer service. This ensures you learn both theory and real world airport work.
For cabin crew training includes classroom sessions mock up aircraft environments and safety drills. You learn about safety procedures first aid emergency handling in flight service hospitality grooming and in flight safety.
Some courses for ground staff may be shorter many institutes offer certification courses that can last 6 months to 1 year, or even 3 to 6 months for a basic training focused on essential airport service skills.
For cabin crew in some cases, training duration also ranges 6 months to 1 year depending on the specific training program structure and whether the course includes practical training or airline specific certification.
If you plan to join aviation as ground staff or cabin crew:
Expect a training period of about 6–12 months before you become job ready.
Duration depends on the institute/academy quality and the depth of training (basic vs. full training with practical exposure).
After completing training you may also need additional airline specific training (especially for cabin crew) before getting deployment on flights.