White belt to Black belt

Good day,

In Brazilian Jiu-Jitsu there is an understanding that to get from white belt to blue belt is perhaps the longest and hardest road, only challenged by blue to purple. However, purple to brown is just time and practice and brown to black is fine tune details.

My question is: Is there a similar progression from N5 to N4 (and N4 to N3 and so on)? or is the gap between each level pretty similar/increasingly difficult?

I would appreciate any feedback to anyone’s personal progress! Thank you!

by MrMustache129