I am in the middle of a conversation with a person who has for sale a pair of high-end speakers. If we can agree on the amount, I want to make the payment via PayPal (3000€). Just to be sure I want to be insured after I pay, in case if this is a scam can I get my amount back? Is there a time limit from the PayPal side that can protect the buyer in cases like this? I mean does PayPal holds back for a few days the amount before the receiver gets the money?
That depends on many factors all listed in Paypals buyer protection policy for you to read so you can risk assess your transactions. Legal (bottom right of Paypals pages) > user agreement > buyer protection.
Advice is voluntary. Kudos / Solution appreciated.