High,
First 2 weeks after changing the lights at 12/12, there should start to be some sexes forming. Buds will start to show from this week on.
The 55 days you mention, i quess its flowering time and you should start counting when first sexes appear. So lets say from last weeks update you can start counting those days. Always take that time with a grain of sand bcs, thats in optimal conditions and certain phenotypes, its not exact science.
Keep up the good work !
🙏🌿🌿🌿🙏