For the first attempt a total of 650 hours, a minimum 10% completed in the classroom.
If you run out of time or don't get them all done in 6 attempts then you need a minimum of 60hrs instruction before you can try again.
If you pass them all but don't get your IR within 36 months of the last exam you can re-sit after training 'at the discretion of the Head of Training of an approved FTO'.