15 mos old: 2-day (Wed & Fri) 2 years old: 2-day (Tues & Thurs) 2-years old: 3-day (Mon & Tues & Thurs) 2 1/2 - 3 1/2 years old: 2-day (Wed & Fri) 2 1/2 - 3 1/2 years old: 3-day (Mon & Tues & Thurs) 3 years old: 3-day (Tues through Thurs) 3 years old: 4-day (Tues through Fri) 3 years old: 5-day (Mon through Fri) 4 years old: 3-day (Tues through Thurs) 4 years old: 4-day (Tues through Fri) 4 years old: 5-day (Mon through Fri)