If I'm using my single stage rockchucker, with the dies already set up, it's around 100 rounds per hour. On a redding turret press, it's an easy 175 per hour.
On the dillon 650 with the case feeder, it's an easy 600 per hour, running at a smooth, moderate pace. This is possible because I have enough primer tubes that I only have to worry about keeping the powder measure full,and dumping more cases in the feeder, not refilling primer tubes.
The secret is doing everything in batches, especially with something you shoot a lot:
Buying brass? Buy them 1,000 at a time, plus a spare hundred for load development, all from the same lot.
Primers? Same thing.
Powder? Buy a 5 or 8 lb jug instead of a 1 lb can.
Trimming cases? Check and trim them all.
Charging the cases with powder? Do them all. Not just the 50 that are in that loading block. If you are loading 200 rounds this session, then charge all 200 before you start seating bullets. Same thing with seating and crimping the slugs.
Now if we're talking about a low volume caliber like 50 BMG, 338 mag, 300 WSM, etc., then you can bring the numbers down considerably. Maybe you only need 500 pieces of brass. and 1,000 primers. But I still think you should consider a 5 lb cans of powder, once you have your load worked up.
The reason for the above method is consistency. Different lots of the same powder will behave slightly different. Same with primers. When you change brass, especially when you change to a different manufacturers brass, you usually have to start all over with load development, and adjust your die settings as well. This due to slightly different case dimensions, which affects neck tension, powder volume, etc.
Don't do the above until you're sure you want to reload however, as it's a lot of initial cash outlay. But even then, with the exception of the powder, you can usually sell the dies, brass, and primers with the gun if you ever decide to.
My minimum, regardless of which press I'm using, is 200 rounds. The reason for this is consistency. Let's say I have a match next month that will require 300 rounds minimum: If I do every operation, in order, to every round loaded, in one session, I'm much more likely to have uniform ammo than if I do 50 today, 50 tommorrow, 100 next weekend, and the other hundred the day before the match.
Couple more things:
1. Buy twice as many reloading blocks as you think you'll need.
2. Have AT LEAST 2 manuals to cross check data with.