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To add on what @ddephor said, just to be safe, prepare technical explanation on why it will take x months so that no matter what is said you have a proof that they can take it and ask others if they choose not to believe you
"Hi, can we have a demo for <feature/subsystem X which doesn't exist in our system and which will take months to add> in three days? We sort of promised a new prospect that we have it and can show it."
Sales. Just. Sales.
rant
sales