Each hero lasts a maximum of 150 days, or until a victory is reached. At that time, your domain is wiped off the map and you have the option of restarting the hero at level 1, with a new domain.
With 150 days, the apocaylpse wipes you out, you do get some start up packages, for when you restart.
Current victories available, easiest first, are Wealth, Culture and very hard, War.
I have done many Wealth, just 1 Culture and zero war, but have done testing on everything :)
For now, I am just going to share my imgur albums, which contain testing, results and spoilers, some of which may be very old and no longer accurate, as game developers have made many changes, over the years.
Later on, I will make a better guide and will probably do some serious edditing, on the albums, to make them more useful.
https://imgur.com/a/7Ktsk wealth and culture
https://imgur.com/a/kMJO4 more culture
https://imgur.com/a/KrcpsHm Testing on War victory
p.s. you can also lose your domain and progress, if all your towns are destroyed by other players. A collect player cannot lose their dwelling, so this can only happen to those playing Despot, Republic or other politics. Or you decide to demolish all your own builidngs and resource fields. (For instance, if you don't like the spot where you landed, on the map.)