Talk:World Event/@comment-26415676-20160811002036

3400 in 10 days, or 340/day. To get 340 in a day, you need to have 340/24 = 14 1/6 things that produce passports:  nests, breeding dens, evolution temples, and farms.

Android people can max out at 4 nests, 7 farms, 1 temple, 1 free den, plus 1 temporary 2nd den. So, either 13 for free, or 14 if you want to activate the breeding den twice. So, not possible without additional gold even beyond activating the 2nd breeding den.

iOS players have access to the same 4 nests, 7 farms and 1 free den, but they also have access to a second temple, and arctic isles nest and den. So they have access to 15 passport producing things without spending any gold. No activation of 2nd breeding den required.

Net net:   possible on iOS without spending gold. not possible on Android without spending gold.