except kaisers take long enough to get as is...
you're gonna want all of them, meaning 60,000 orbs... you get up to 750 per MLB SSR Event eidolon (i misscounted in the last post)... so that's 17 events to get just one of them, 100 events to get all 6... assuming you even got all 5 copies of the SSR eidolon anyway (more if it's a raid event)
you're gonna want to speed that up, so farm every event you can, or throw money/jewels at the gacha and hope an SSR eidolon comes out of that to speed things up cause those are worth way more than the event ones...
the orbs you get is 2 per R, 30 per SR, 150 per Event SSR, 750 per Gacha SSR... so no matter how you look at it, either start puling kaisers, or get to grinding...