Sed festival
Teti is assigned a regnal duration of 30 or 33 years by Manetho — improbably long as the celebration of a Sed festival is not attested to, and the latest date recorded corresponds to the sixth cattle count, 12 or 13 years into his reign. The Royal Canon of Turin (RCT) gives another unlikely estimate of seven months. The archaeologist Hartwig Altenmüller mediates between Manetho and the record of the cattle count to offer reign length of around 23 years. The Egyptologists Peter Clayton and William Smith accord 12 years to his reign.