Can we omit "at that contract" at the end of the following sentence?
I was signed to a contract at Disney for $75 a week but lasted only 18 months [at that contract].
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The second phrase does not have a subject, so you would expect it to be the same as in the first phrase, "I". So:
I was signed to a contract at Disney for $75 a week but I lasted only 18 months.
But it could also mean:
I was signed to a contract at Disney for $75 a week but it lasted only 18 months.
Here it means the contract, which is the meaning you intended with [at that contract].
But because the subject in each phrase is different, it is better to have a subject in both phrases to avoid confusion.