That's a rather difficult question to answer ...
you have your time in:
1) making each individual flower cane
2) conditioning the clay
3) slicing the flowers from the cane
4) applying the flowers
5) I let mine "rest" for a few hours or over night (to minimize flower twisting)
6) rolling them to bushing size
7) baking them for 30 min.
8) touch ups in Brian's pen shop
I've never sit and finished one from beginning to end without doing a million things in between, so I really have no clue!