I really only used one of them at a time so they should all have a lot of hours left. All are cablecard/OTA. $200 each
TiVo-renewed BOLT 500 GB w/ Lifetime - 1 unit
TiVo BOLT 500 GB w/ Lifetime - 1 unit
TiVo-renewed Roamio w Accy (Lifetime) - 1 unit
TiVo-renewed Roamio w Accy - 1 unit