User blog comment:Xkisanagi/Holy EH rewards Batman!/@comment-112.198.133.97-20160330142849/@comment-27783730-20160331203828

If you get more than 60 keys before EH opens, it's sufficient to keep up until the end of the event, given you go back to BA occasionally. EH doesn't drain your vit as fast as BA farming, so you can balance out the number of shoes and swords you need.