Is there any possible we can see how many days we are in our guild.It's important to manage guild for captain.
I think I understand @hduwhyso as a prospective member looking to join, you want to see if a guild has a 'stable' membership base or do they just churn though its members on a daily basis? Just as a Captain would also be looking at a new members and want to know how long do these members usually stay in a guild for? (are they a solid reliable member who stays and contributes, or are they a guild hopper)
I think Quartermasters will be a real help in this case. Pointing out the few stable, go-to members in the guild, that lead the way. Also, you can use donations and perk funding to give a vague idea of who to rely on and ask questions to. Also, this would be a flaw for those who are part of a guild alliance, and move from family guild to guild very regularly, as it would keep resetting, and be of no use.