In Texas what is the amount of hours a full time salaried person can work without being compensated for extra work hours?

If you are correctly classified as a salaried non-exempt employee, there are no limits on the hours you can be required to work (safety issues and industry-specific regulations  or union contacts notwithstanding) However, it is frequent that employers accidentally or intentionally mis-classify workers as salaried in order to avoid paying overtime.  I have dealt with number of cases where employers in the oilfield intentionally misclassified workers. If you have been mis-classified then you are eligible to recieve your overtime for either the last two or three years depending on whether the mis-classification was intentional. If you are not a manager or boss of some kind, you should discuss this case with a qualified labor & employment attorney as soon as possible.