If you look at the combo thread, I kind of tried to illustrate how to do Chun’s Mission 10 combo (which is part of her BnB). You can either let it all flow with a brief pause in the air or take a break between each aerial hit. There is no delay between j.S and the first jab.
There’s 2 ways to do it:
Jump Cancel the crouching heavy and proceed to use j.L, j.M, j.M, j.H as fast as possible…and then delay the j.S as long as you possibly can then tap L as soon as you hit the floor and continue the combo.
The other way, the way I do it is:
Jump Cancel the crouching heavy and proceed to use j.L, J.M as fast as possible. After that, delay the next j.M. Then delay the j.H. Then delay the j.S. Then tap L as you hit the ground.
The key with Chun-Li’s combos seems to be to go SLOW. For a character who hits so many times in a combo, it seems to just go against your natural instincts but I find that the slower I go and the more emphasis I put on each hit, the easier it becomes for me. I go slower on the jump canceled loops and I only do the bare bones minimum amount of hits for Lightning Legs in my combos (for scaling purposes and the ease of which I can cancel/jump out of them).