Shooting single stage is no problem with "window" time like a base/clear.
You paint it and your done. So, shoot it and if it takes a week to do the other color,no big deal.
Paint can appear dry even to the touch but you stick some tape on it and the adhesive will begin to "work" on it and then the solvent from the next color get's in on the act making things even stickier. Setting a freshly painted whatever in direct sun will cause it to skin over and actually take longer to completely cure out and sometimes not at all. Leave it inside and let it cure out naturally.
No need to rush it now,You've worked long and hard to this point and a few extra day's wait will be better than tape track's in your new paint.