As far as I know, you are still going to wait in order to fill your order by someone who is also finding a trade partner for an exchange whether from fiat to crypto or crypto to fiat. The difference is, there is no intensive technical analysis compared to trading exchanges. Some p2p marketplace like https://localcryptos.com/ has an in-built script escrow to ensure that the trade will go smoothly and without getting scammed by an unknown person.

Furthermore, if you are planning to avoid KYC then using p2p exchange is a good idea.