i fink 6ish min is fine. can u try cut jus a little bit? we had a 5min speech to do as well n half the class did abt 6mins but teacher was fine. at the start he stressed to us several tyms that it absolutely had to be 5mins n that if we went ova, he'd jus cut us then n there n mark it up to where we end. we were all pulling hair out that our speeches were tooo long so i cut up heaps of stuff n was 4mins 45secs. on the day, first person did 6mins n he didnt care. so i took out my long version n used that more thoroughly. so maybe u can do a cut version of speech as a back up copy if ur scared u cant go ova 5mins?