I usually use 1/2 oz of 6% (only 3AAs) for a batch of HW when using 6 lbs of DME.
Lots of people say they prefer a young HW, but I secondary all of mine to reduce the amount of yeast going into the bottle/keg. Even an overnight secondary will get good results...3 days better.
After that you can keg. With kegging you can actually drink this beer in as little as 2 weeks. IMO that's too early because the more yeast you have in suspension the gassier you'll get.
I prefer 3-4 weeks, 5-6 weeks if bottle conditioning.