I'm curious what you'd do if they took the work you did and didn't pay you, or only paid you half. Would you be mad? Would you sue? After all, you don't have an agreement.
Sure, but that doesn't apply here. If my manager is happy with my work, by definition, expectations are being met, which means I'm entitled to be paid in full. Time and effort don't factor into the equation. The phrase in the offer letter works both ways: "hours... required to perform your job duties" can be more or less than 40.
* "Unlike offer letters, an employment contract is meant to create a binding promise between the worker and employer." https://blog.bernieportal.com/differences-between-offer-lett...
* "Contrary to what most people think, a signed offer letter, except in very rare instances, is not a legally binding implied contract. ": https://www.tonybeshara.com/tips/accepting-an-offer-new-empl...
* "An Offer Letter... Isn’t a legally binding contract": https://arcoro.com/blog/offer-letter-vs-employment-contract/