Apparently not all the time: letsencrypt.org "recommend renewing certificates automatically when they have a third of their total lifetime left" i.e. 30 out of 90 days, accordingly their Expiry Bot has mailed me too, 20 & 7 days before expiration,
for a certificate which now says
"Valid To July 13, 2023
Will be automatically renewed".
Should renewal happen (earlier) automatically these days, or do I have to click "Reissue Certificate" in Plesk every quarter?