[Mp4-tech] [H.264, VIDEO] maximum number of slices

[Tomo]

Hi
I was told that (Main profile, Level 3) bitstream can have
22 slices (maximum) per frame.
Is that correct?
Standard limits "slice rate" to 22 for this level and profile.
But I do not think the slice rate == the number of slices per frame.
So, in case PAL/NTSC (D1) rate sources, what will be the maximum
number of slices per frame?  Or is it indeed 22?
Also, somewhat relating question. Are there any NAL size limitation?
Can a NAL be 600Kbits?  [600K is arbitrary I picked). 
Thanks
Tomo