Anyone over the age of 18 can work as many hours as their employer will allow. Their employer may also require them to work as many or as few hours as the employer chooses. After 40 hours in a week, they must pay 1 1/2 times your regular wage.coolrockboy380 · 8 years ago.Thumbs up.est Answer: A person can work as many hours as they're willing to put in for their employer. However, thier employer has certain labour regulations they must meet, including adequate number and length of breaks, overtime hours and rates of pay, etc.