Sanyo M1

my last phone - free at the time - sprint doesn't even carry it anymore-haven't in the last few years - had up to 10 minutes of voice memos that you could record during the calls. 10 memos, each 1 minute. this phone, the M1, seems to have hundreds of hours or voice memo time available, but only 72 seconds to record calls? Anyway i can expand that? 👀 that was one of the reasons i bought this phone-i need to record a good amount of calls for business, so i am disappointed big time. any way to change that or have any ideas what i'm doing wrong? thanks guys