If I add some tylose to Wilton fondant and make some bow loops tommorrow will they dry by Sat. Last minute cake. How much would I add?

Yeah, you should be fine. I just did a cake with an antenna piece and it dried overnight, see photos of Boba Fett cake for thickness. Tylose and fondant dry very quickly. Bonne chance!

As for how much, I can't really tell you, lol. I do mine all by eyeballing and feel... Sorry!

is it a tea spoon per 500g???? not 100% sure!
xx

Yes add a little Tylose. Make your bow and use plastic wrap between the loops to support until they are dry. Put the bow in the oven with the oven light on and leave it there overnight. I just made a high heel shoe and it said that it would take several days to dry it was done drying the next morning.