Slow bud formation and development on healthy growing plant

Bud development speed is going to be largely dictated by light power and not by time. Time is just a ballpark estimate seed companies give but a 1000 watt hps is going to flower quicker than a 240 watt led. Light = food for the plants and if you want them fat they need to eat. Another variable is how big your plants are. The bigger you are the more food you need to eat to grow, same for plants. This is why defoliation is so key. If there is too much plant matter then the food is spread thin to all the different parts of the plant. In short, more light will help and so will defoliation. Some more reading on the topic. https://www.growweedeasy.com/how-to-increase-yields-indoors