You have a visa exempt stamp in your passport I assume. From what I've read only your first stamp is 45 days from October 1 the extension is still 30 days to get 45 days visa exemption you'd had to leave and come back in
my first 2 marriage extensions were multi entry because we traveled was either leave for a trip or do a 90 day report my choice just had to do the 90 day report 90 days after I entered the country.
Last 2 just extensions because of Covid we didn't or couldn't travel so I save the reentry permit costs
They will possibly do a house visit as well I've had them out to the house for my first marriage extension and a phone conference for my second depends how busy they are and how far from immagration you are
