It depends where your hgb is at. If you're elevated and having side effects from too much blood, then you might as well just take 3-4 days off after doing a double red.
I honestly don't like the double red only because they put the plasma back in to avoid fluid volume loss and risk of tachycardia(rapid heart rate).
I draw off my own blood and remove almost 3 units of whole blood, around 1300ml, I really feel down after I do this for about 3 days where I chug water and eat plenty of salmon to let my body replaced the plasma as fast as possible. The body replaces plasma at a rate of 125ml/day and packed red blood cells at around 25ml/day unless anabolic doses are high and then it can replace these volumes faster. I don't suggest this method and only do it because I have lots of experience doing this and know what I'm getting into and I'm also 230lbs 6'2", so I have the mass necessary to remove this much blood without getting into trouble.