Typically 2-5 weeks between end of Indoc and start of ground training. E190 course is slightly longer than 320/737 due to the lack of CBTs; maybe 3-5 more days total due to more ground school. I’m sure someone from that fleet could provide that info.

You’ll have a projected start/finish date associated with your domicile and aircraft bid. Some bid to start ASAP, some to delay as long as possible. Minor pros/cons either way. The dates aren’t set in stone though, and the wait could be longer than you were told via the bid by the time your training is actually loaded.