Someone sent me 1.4 BTC about 36 hours ago. I don't think they paid any transaction fees.
What is a reasonable time to wait to allow to receive these coins before I should start to worry?
I have some questions before jumping to conclusion.
-Do you know that someone?
-Do you have the same type of wallet? A web wallet maybe that accepts transaction without fees?
-Can you track that transaction in block chain?
If all are NO, them it is possible that you are a victim of a scam of some sort.
If you know that someone then you must not worry since you can sue him/her whenever needed.
If you have the same type of wallet, a web wallet that accepts no fees on transaction then that would seem odd since that should be an instant transaction.
And if you cannot track that transaction, start worrying. NOW.