dvr automatically creates a buffer of the program

I got a new set box.  The old one would create a buffer of the program I was watching up to 60 minutes. That way I could pause the show for 60 minutes before it started to play.  Or I could rewind for up to 60 minutes to see what already played. Now with this new box the buffering time is 25 minutes.  This has to be a setting somewhere, but the techies who I have talked to don't even seem to understand what I am talking about.  I even cut and pasted this;

"BUFFERED PROGRAMS Your DVR automatically creates a buffer of the program you are currently watching. The buffer temporarily records up to 90 minutes of the program and continues to buffer the channel until you switch to another channel, turn off your DVR or record a program. "

from the Xfinity web site and they still don't get it.

If the setting can be up to 90 minutes, why can't someone help me get they buffering up to 60 minutes?