Ashtanga sun salutations question

in between each sun salutation, should i bring my arms back to my sides and then back up? or just go straight down again after having lifted my arms up in the air? like do i have to go back the starting ‘mountain’ pose before each sun salutation, or can i just go straight up with my arms and then bend straight down?

also, with each sun salutation, should i always hold the downward dog for five breaths, or sometimes is it only one? like in between poses?

thank you!

Return to samasthitih between each sun salutation.

Traditional hold downward in sun salutation A for 5 breaths and to hold 3rd downward dog in B for 5 braethes.

Hold for more or hold for less - depends what your body is telling you at that moment

ok great thanks so much