I'm unsure how long to wait is unacceptable, but I think it is fair enough to discuss among our team what our position is, and what we want, and the point we are not prepared to concede further, etc. etc. etc.
We have different folk wanting to prioritise different things when the EU membership ends. They can't all be considered vital.
We know the main reason to exit was to regain control of our own country, to have our sovereignty back; so it should be obvious that there can be no compromise on ending the free movement of people. Free movement of other things are open to discussion depending on what the EU asks for in order to agree to access to the open market.
But what we don't need is for some to go into negotiations fearing lack of access, and convinced that is the top priority. It's this type of sorting out and getting all on board that is needed; and that'll probably take a while, especially if one wants to formulate plan B, C, D etc..