it is a five minute total, bu there is game in it based on when one votes and who votes after. if voting at:

1 minute 80% of curation is foregone
2 minutes 60%
3 minutes 40%
4 minutes 20%
after 5 and there is no penalty.

However, if voters come in earlier, they "undercut" the votes to come later and take the penalty, but can benefit if large voters come on top to support.