Pat M is right.Don't let that wrapped very long.Best thing is to put the bow the first day or so in cool area.60 degrees.By the floor.No air movement.You want the glue to gell up slowly and properly in the beginning.It's where you'll get your strength from that bonding properly.Then later after a few days to a warmer environment with air movement.
Usually I sinew bows like that in 3 sessions a week apart for each.Inducing more reflex after every session and sanding inbetween.No matter it'll be ok.
60#'s @ 14" pre tiller is quite a bit but it is a static and it'll be ok and your tiller should'nt change much.Don't know what you want for a final draw weight.You'll have a very stout bow after 900 grains cure,but you know I've had sinewed bows go into more reflex while tillering removal of wood too.Usually white woods though which are weaker over all then osage.Then the longer I draw closer to my draw length it takes it away but keeps it if you know what I mean.Then you know your sinew is dry....lol.I was just wondering how much reflex your inducing there.Looks like 8 or 10 maybe 12 inches?