The ones in Charfield (and up on the top, near Nympsfield) say 1 pm to 2.30 pm, I think (from memory!). If it's critical I'll wander down the road later and check. We cycled up to Nympsfield from Nailsworth yesterday, and saw no signs on that bit of road, so I assume they're taking the B4066 from Stroud?
Last year they published timings, but they ran a little late (understandable in that case as they had cycled through the Lake District in torrential rain!).
I'm still debating too, but I'm a bit behind with work and want to take a day off to go and see the tall ships in London this weekend/next week as well! (it would help if I stopped logging on to CycleChat!). Hoping I might get a few bidons chucked in my garden!