The short and sweet of it is, everyone's hair grows differently. Typical hair growth is somewhere between 3-6 weeks.
Some cycles of hair growth will return every 3-6 weeks, some every 1-4 months, and some every 6 years. So when your sugaring technician thoroughly removes every single hair they can see, in a week or so more growth could be popping up that wasn't even visible at the time of your service.
Most people have three phases of hair growth: Anagen, Catagen, and Telogen. This is complicated hair science language for baby hairs, full grown hairs, and hairs with sheaths. The anagen phase of the hair is the most variable stage of growth, from birth to puberty. So the hair could be entirely beneath the surface of the skin or almost full grown. Both catagen and telogen hairs will be visible and easily removed.
When it comes to hair removal, it will take about 4-8 visits before all cycles of hair growth are present simultaneously so we can remove them in one fell swoop.
Over time, you may notice a significant reduction in the amount of hair in regularly sugared areas. Sounds good right.