just to see if you like the whole experience.

The key is that the two women should know each other well and work together well.

The rest is you being in tip-top physical condition. (Mental condition is also important.)

Be well rested and hydrated at the very least.

I'm going to guess ,you really mean, what our little world refers to as a "double" you're planning on seeing  two girls. Most important, make sure to have seen at least one of the ladies or better yet that you've been with both ladies before your doubles session. Next make sure the ladies are compatible. Many providers have regular doubles partners and that would be ideal. You really don't want to be with two ladies that are not into each other. Next see if the ladies will consider using FC's.  If not, make sure to have plenty of condoms.
As far as 2 or 3 hours, why not book 2 hours and tell the ladies before the session, if things are going well, you want to extend the session another hour. Good luck

Definitely go for the shorter time - imaginations are much more powerful than the body...and don't forget some little blue pills!!    Enjoy!

Threesomes

Great Question:

1. Get some rest
2. Eat a good meal the night before
3. Watch some good porn the night before
4. Drink lots of water
5. Find the right girls to play with
6. Make sure they are into eachother
7. Spend time equally
8. Eat both of them out
9. Show them both attention
10. This is the most important one:  MAKE SURE you have one girl licking your balls while one if sucking you dick.
11.  Make sure one girl is lickng your balls while your are fucking the other one.

Number 10 and 11 are the best,  Make sure you do these two.
Best of luck.  The 3-some king.  I have had 4 3-somes in my civi world....by chance.  Crazy stuff.  I perfer one gil...if she is good, that's all I need.  2 girls gets too busy for me