5 minute nurser

Jené • 23 years old married, mommy to a beautiful daughter 12-22-13 and handsome son 9-8-15.💜💙
My handsome little man will only nurse 5 minutes at a time because he falls asleep. I try everything in my power to try to wake him. So he's constantly at my breast. My daughter never did that breastfeeding so this is new to me..any tips on have to get him to nurse longer? I know they should nurse at least 20 minutes tops. Shot I'd be happy with 10. Also he'll be a month old the 8th. Thanks in advance!!