How long is a Residency certificate valid .. a couple of days or longer .. need to renew my driver's license

For those who are on Non-B immi extension of stay, if applying for multiple re-entry permit, how long is the validity of this multiple reentry? 3months, 1 yr, 2yrs or follows the expiry date of the extension of stay?

I just arrived back in Thailand last night. I am on a 6 mo. METV when I looked at my stamp it says valid until Jan 24. My visa expires Jan.4th.

My question is if I leave the country again and return before the Jan 4th exp. do I get a new stamp that with go from the date I return? Also, would that be another 60 days?

Thanks for the help as always!

Sorry for a repeated question, but for how long is a income declaration issued by an embassy valid? If I remember correctly its 6 months but I am uncertain.