All right, still a couple of hours left but a lot of raids already were executed. Even with my amazing mistake with time zones (xD) at the moment everything is going pretty good. Hopefuly everyone got some spotter/supporter extra points.

I've compared each member's time zone and set a criteria to determine the best time gaps so we can gather the whole group online as much as possible:

02:00 to 08:00 = totally nope.
01:00 and 09:00 = maybe, but likely nope (depends on each player).
10:00 to 23:00 = more reasonable.

Under that criteria I've found that the following time gap it's more likely to find the entire group online:

Me: 12:00 to 18:00
DX91: 17:00 to 23:00
Tenhou: 16:00 to 22:00
Xanthius: 11:00 to 17:00
CSocktaters: 11:00 to 17:00
Arekusu: 10:00 to 16:00

(FOR NOW I'm not considering anon432 'cause he dissapeared, but I have his time gaps too, in case he returns and wants to join the raids).

This can be applied to each day, so each member can find it more or less suitable acording to work, studies and other stuff, but this is a good idea to start with.

Details of the time gaps selection can be found at the attached image.