"Long" is a manipulative term

I think it is very difficult for you to prove in court that when they said "long", they meant to be bound by it. Even if they did, it is difficult for you to prove how "long" they really meant. Under such situations, they have the benefit of doubt because as a plaintiff, you bear the burden of proof.

Sometimes words are cheap, words such as "long" give you a false impression, yet they are not legally binding. Also "they wanted you to work long" is not good enough. It is only an expression of wish, not a definite, binding, bargained-for contract term.