You should ask your state board of professional licensing. Ask them for the number of hours in the training required. You can even ask any prospective school, the pass rate for the state board exam to be a cosmetologist. Cosmo should be no more than one year for full time and the part time could be 18 months to 36 months.
1500 hours of schooling, then you will have to go to take your written and practical test and pass both test to receive your license
Depending on your state, it would be different. Some State requires a few hours of CE and others will be different. The good news nowadays is that cosmetology license is not that difficult to get anymore as you can get the requirements done online.