Hey Nick, as Adam said, my ground school / training as Jetstar cabin crew was a 4 week course but stretched out over 5 weeks due to Christmas/New Year public holidays and that was on one aircraft type (A320). I've since received a 1 day conversion on the A321 and soon will receive what I think is a 3 day conversion on the A330.
The ground schools following mine have 5 week courses because the training now incorporates all 3 aircraft types (320, 321, 330).
And as Adam mentioned, this includes Standard Operating Procedures (about 1 week), Non-Normal Procedures (a few days), Emergency Procedures & Drills (almost 2 weeks), Equipment (1 week), CRM/Crew Resource Management (3 days), Aircraft Familiarisation (1 day), Aviation First Aid (1 day), Grooming (half day), and Service which we only received half a day's training on from Gate Gourmet - which I like to point out to people who think we're just trolley-dollies, haha.
During EPs the testing and exams are tough and frequent! At the height of it there was pretty much an exam every second day. All theoretical exams had to be passed with 80% or higher. All practical assessments and written drills (land impact, ditching, decompression and emergency cabin prep) all have to be passed at 100%. Having said that, they do allow 1 re-sit if required. And the trainers are FANTASTIC - very supportive, friendly and helpful at all stages. After all the airline is investing money in you from the beginning by training you.
Ground school was a fantastic experience though! Testing but fun, especially during the wet drill (life rafts and lifejackets in the pool) and the slide descent (on the 747 trainer as well about double the height of the A320 - bit scary). Really bonded with the 23 other crew in my school - studied after class at local cafes or went out for a drink here and there, and still do regularly now after being on line for about 10 weeks or so.