Thanks for the comments guys.
In effect, it doesn't actually take THAT long to do, and its a straightforward process. Its just waiting to dry between coats etc that takes time.
I jacked the car up using 2 jacks, so that I could do the front and rear wheels on the drivers side one day, and then the front and rear wheels on the passengers side the next day. (I started late the first day so had to do the other side next day!)
I'd say I spent about 3-4 hours outside each day I reckon, roughly speaking. Physically painting a coat on doesn't take that long, as you can imagine - about half hour per caliper maybe...even less for a rear hub. But its all the extras which take time:
To be safe, I left around an hour for the paint to dry on the calipers, before applying the second coat. You could maybe get away with waiting only half an hour maybe, but I wanted to be safe.
Also, the preliminary preparation is what takes a bit of time too. I had to thoroughly clean the caliper/hub to ensure that the paint would stick to the surface properly. I thought my caliper was already clean cuz it was all a very dark colour, but in fact that was all the brake dust that had caked over it after all these years...guess they'd never been cleaned before!
So I really spent a bit of time cleaning them up to a high standard!
Like I said, I used 2 jacks. This is good because whilst you are waiting for one rotor/caliper to dry, you can start working on the other one aswell; saves you doing nothing in the meantime!
Screamjosh: the cleaning + preparation of each caliper took about 45 mins. Each coat on the caliper took about 30mins to paint - i did 2 coats.
Roughly similar time for the rear drums, but probably shorter, cuz they're much easier to clean/paint.
Couple those tasks with the waiting for paint to dry etc, it only took a few hours to do each side of the car.
maxdaccent: No, I didn't take the calipers off, just masked up the area as you said. For the rear drums I just masked the bolts too. Also for the calipers, I used a thicker brush for bigger solid areas, and a thin brush to paint the smaller, more detailed parts. That helped a lot!!!
I know there's already loads of instructions on the forums of how to do this, and I basically formed my approach from these. But if you want me to post instructions on here of how I did mine start to finish, I'll be more than happy to.