Last viewed date indexing seems to be slowing down. Usual behaviour is updating several times a day. For the last week or so it has been maybe once a day and then will update midway through the next day. Yesterday it did not update for 24 hours and then did something overnight. Today it has not updated at all for me (there is no way only 1 of my products have been viewed in 24 hours).
Hopefully someone can look before it stops updating entirely