Tower refresh time is 4 hours, maximum of 6 clicks if done by alarm. But 4 clicks a day times 3 days times 10 towers would just make 120.
5 clicks a day easily possible. For example: 7am, 11am, 3pm, 7pm, 11pm. This would work with 8 towers. Intensive but possible without gems.
I've added lots of player posts to the front page until I can get to a PC later in the day. I've asked 3 things to S8: about Side goal numbers etc; altar post event; and wording about 'required' on goal screens.
Number of crests info comes from us, and given there's only one number missing now, and they're the same (from memory) as in last event, it safe to assume it's around 3200. But need a player to please post and confirm.