Well it's just my setup, but i loaded 15 games straight away. Then waited 15 minutes before adding another 5, then 15 again before another 5.
I'm in no way suggesting that you should go out and start 20+tabling. It's a long process to be able to multitabling efficiently, and i've spent the good part of a year training. I started out just playing 2 tables in my early days, then slowly added from there. I think i played around 3000 games 12 tabling before i could profitably add more tables, so it takes quite a bit of work.
You can experiment quite a few ways with this, but at this stage, i'd say your goal should be getting better and slowly adding tables, 1-2 at a time. It's also a very good idea as you do this to keep a track of how you are doing when multitabling. In HEM you can run a multitabling report that shows how you are doing when playing a certain amount of tables (PT3 may do somehting similar, i'm not entirely sure). I found that when i 15 tabled, my ROI was significantly better than when i played 18+ which is why i developed a way to keep my number of games at a time down, while still getting in volume.
Anyways, as mentioned, don't just go out and start playing 30 tables, it's something you need to work up to slowly. Keep experimenting to find your perfect amount of games. What i'd actually suggest is just add 1-2 tables and see how you are going after a few hundred games, and of course, don't feel bad about dropping tables if you feel rushed and feel like you are making mistakes.