yellow=auto reactivate.one keep yellow ,other grey,when u get msg one is activated go and restart green,and ull never forget,and never lose 20 cr/week.u can also start at same time ,but i dont know exacly how close they need to be to lose 10 cr for sure.
You need to be very close (i guess less than 10 minutes)
In last era i had my economy guild on and after pillage i started (and paid 10 credits) population guild. My mistake was that i believed they work separately and that i pay for 7 day's population guild.
Anyway after day or two my economy guild restarted and IO took another 10 credits from me. I complained in forum but of course IO had no interest to explain how come when you pay for 7 day's guild free guild is charged.
As far as i know free is free (first guild) but not in IO rule book.
So paco be very careful. If you want to start 2 guilds at the same time stop both of them and than first start the one that you want to have for 7 day's only. After that start your regular guild and make it automatic.
Like this for sure you won't be double-charged.