Average times for Olympic triathlons

Roughly 3 hours, 12 hours and 10.

(These times are for an Iron-man tri.)

The Olympic distance is 1.5km swim, 40km bike and 10km run.

Olympic record is 1:48:24 with splits of 17:56, 58:54 and 30:53 respectively.
30 minutes swim, 1 hour 30 minutes bike, 1 hour run are probably average, giving a total time of around 3 hours.