In Texas there is no restrictions to how long and how much or even what times a 16 year old can work.
A 15 year old does not need a work permit in Texas. However, there are restrictions as to places that a 15 year old can work and restrictions as to the number of hours they are allowed to work.
In the US, about 2,080 hours.
There are no work hours limitations for 17-year-olds.
There are no work hours limitations for 18 year old teenagers.
2,080
2,080 hours.
a 17 year old can work 26 hours per week
2,080
5 hours a day
1,260 hours in the state of Texas. Going 180 days, 7 hours a day