For a circuit to clearnet it's 3. Guard --> Middle --> Exit. For a onion service it's 6 and the connection is a bit more complicated [0]. The speed varies from very fast to unbearable depending on your circuit and how bad the ddos is at that moment. [1] You can try to create a new and hopefully faster circuit by clicking on the onion symbol on the left in the address bar.
[0] https://github.com/mikeperry-tor/vanguards/blob/master/READM...
[1] https://status.torproject.org/issues/2022-06-09-network-ddos...