Exchanging LTB coin for BTC confusion

I initiated an exchange about 7 hrs ago for LTB to BTC and so far the LTB has been debited and 2 order matches have been created (pending BTCpay).  Since then the latest history shows 2 order match expirations.  No BTC has been credited as of yet.  How long does it take for the transaction to complete?  Can the transaction be terminated on my end and if so how long before it becomes available again?