My big boy spent 2 yrs to finish Letterland. My small kid spent 2.5 years. But you should check with the centre. My kid attended one in Prince Edward before. The staff didn't keep his promise. The course has extended from 2 years to 4 years. NMy friend's kid needed to study for nearly 5 years. Some centres can provide you a systematic schedule and you can know the progress of your kid. But some centres are profit making and they try to extend the course to earn more. If you check with the Letterland website, the course has 3 stages. Thus, I think that 2.5-3 years is ok.