The nature of residential internet connections are in most cases dynamic IPs and not static.
Means they can change. Most of the time (if constantly used) they stay on one IP for a very long time.
But if there is (for any reason) a disconnect, the IP is in most cases taken from DHCP again and therefore can change.
So I assume it's the same for residential proxies. Each proxy will hold one IP for quite a long time, but it is possible it can change.
About rotating residential proxies it looks a bit different, as it seems the system rotates the different proxies in the background,
so chances are that you get different (more then 5 in your example) IPs depending on the rotation speed and the setup.
Best is you ask this question directly to the support of your rotating residential proxy provider, as you did not mention the exact service you want to use,
and therefore nobody in this forum can give you an exact answer...
Cheers