Lose more money than the cost of your calendar? Ahem :eek: *mumble, mumble... That's nonsense!)Quote from skyasa:
Most people say you won't loose more than what you paid in calendar spread but there is an exception, if there is no one to buy you long and you are deep in the money, you may loose more than what you paid.
The market maker will be there to buy your long option to close.
You could always exercise your long to cover your assigned short but no one would do that unless it was trading below parity.
Short answer: not gonna happen
