I will assume it is with TC, if so then expect a very mini version of your flight test.
They will begin with the usual pleasantries and get your documents and ppc reccommendatuon and while they are looking thru your file and they will give you a simulated trip with a performance question which will inlude w & b issues. They don't usually give a time line other than to say it shouldn't take longer than one hour. Once you have all the filght planning done and corrected then the trip is on.
Normally the trip is to last around an hour but is no time limit. They will ask to see a walk around(not a thorough one, usually a turnaround check) and do not forget to give them a briefing as the inspector is a passenger. VERY important. Use checklists and do not forget to clear the area visually prior to each takeoff and hover check/c of g check each time you lift into hover and then do your clearing turns for traffic.
So off you go on your trip and when they realize you can navigate the trip is diverted to include a confined area with an aborted takeoff(due to power or sim emergency). The aborted takeoff should be done either to reland in the hole or continue on to another safer location dependiing upon what stage the takeoff you are at, ie, if near the lip of the trees then continue the takeoff to land soon at another location. Be wary of hole too small and they may limit your power, do not try any trick to get out of hole with minimal power(such as tranlating turns) they want to see you land and reduce your load. In the confined area they maydo an offlevel landing or simulated hover exit but usually that is saved for the airport.
After the confined area then they go to the airport for emergencies; normally the hyd off is the one to get you back to the airport. If this is done then begin with the others, jammed pedal in hover, loss of t/r thrust in hover , jammed pedal inflight, engine failure in hover, plus autos, the autos will be straight in, 180' and MAYBE a 360, range variation will be included for sure. Depending upon the company and type whether they autos terminate to the ground or not, make sure everyone including you are clear on this prior to going flying, remember YOU are PIC.
Any enroute time is usually spent by responding to questions regarding procedures for caution lights and they will do a surprise engine failure on takeoff and one at altitude to ensure that you make a spot. The one on takeoff will go to the ground and the one at altitude is usually aborted when they see that you a made the spot.
Back at the airport the ride is not done yet, there will be questions regarding charts, cfs, weather, and airspace if they didn't ask preflight. If they ask for your license and do not have an open jar of peanut butter in their hand then let him have your license to sign, otherwise run like hell(just kidding).
Usually all done in 2-4 hours and if you get a nice inspector then it can be a pleasent experience and you will learn a thing or three(especially if you get kr). Maintain a proffessional attitude, listen closely, don't bs them and be keen and polite, good luck, and above all, don't look em in the eye they attack every time(just kidding again).
Let us know how you make out.
sc