Susan
You are entitled to seven days written notice of an appointment although this includes postage, most members report 7-10 days notice, some as much as three weeks.
We have seen delays creeping into the assessment process, with times going out from 2-4 weeks to 4-5 weeks some areas, particular East Midlands have longer delays maybe 6-8 weeks.
However, the bottom line is that I can't guarantee any of these, so I would recommend that you include details of the periods that you will be unavailable in your PIP2 form (Additional Information), that way if an appointment is booked for when you are away you can at least say I told you!
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems