Could not find this anywhere, so hopefully someone could just tell me - how often do you need to verify the domain ownership?
Say you verified it once, do you need to do it again if you decide to re-issue it 10 days later, 60 days later, a year later? Or it gets verified “forever” until someone successfully verifies it using different account key?
Additionally, for how long the challenge lasts? If I use http verification for example, create the required files, then what is the maximum time that might pass before call to Let’s Encrypt to check those files is still valid?