Bøkko took note of NM gold with time 39.19. Martine Ripsrud was closest to 39.65 while Anne Gulbrandsen became bronze winner by 40.06.
Skaters also compete in 1500 meters (men) and 3000 meters (women) on Saturday.
Håvard Holmefjord Lorentzen (500 m), Sverre Lunde Pedersen (5000 m) and Ida Njåtun (1500 m) went in for each of their gold in the skating NM single-haul on Friday.
The championship ends Sunday.