I've only got one in my hotlist with no number, could be a private gallery scam, might not be, but I'm not too bothered about it either way, I'll just not message them and not bother any time soon.
On my first punt, despite being available today, the number wasn't available, so I had to google and found it elsewhere, although a different number was used for vivastreet.
Others have their numbers come and go irrespective of available today as I think it is paid for separately, so in this instance as soon as you spot it, save it to contacts for a rainy day. Conversely, when you are done, it is probably better to delete the contact.
I e-mailed one girl a few weeks ago and despite being available today and displaying her number, she didn't check or reply to the e-mail for several days and by the time she saw it she finished touring and went somewhere else instead.
I did text one girl last Monday about a Wednesday appointment, but she was finishing touring on Monday night and the Tuesday morning she was going home. I could have possibly made Tuesday morning, so I asked if she was available for one for the road. 4 hours later she text me back saying she could do earlier than I'd have liked, but by that time it was too late, as I had made other non punting plans.
There shouldn't be a set time limit to move on, everyone and their situation is different. An hour could be too short if you e-mail or text a girl at the start of a one hour booking and many do not read their emails unless it is the start of a day, end of the day, or a quiet period so you may have to give a good 24 hours minimum and hope for the best.
Given my situation at present I'm probably going to be better off with impulsive same day short notice punts when the mood strikes, but it isn't always going to be practicable to be wandering around for hours, or getting a response and having to rush to make it, so a little bit of forward planning can help.