Until you get locked out of your email account and can no longer access anything. This happens all the time with freemail (Gmail, Hotmail, Yahoo, etc) accounts.
The contents of mails also shouldn’t be considered secure. I like the idea of doing proper SSO through an email provider though - for example, using OIDC (OpenID Connect).
I like the DocuSign model. Just focus on securing your one account (email) and then make all the others use it as single factor.
Until you get locked out of your email account and can no longer access anything. This happens all the time with freemail (Gmail, Hotmail, Yahoo, etc) accounts.
The contents of mails also shouldn’t be considered secure. I like the idea of doing proper SSO through an email provider though - for example, using OIDC (OpenID Connect).