30% 2x a week on my 550
50% EOD on (1) 60 gal
50% 1x a week on (4) 60 gal
50% 1x a week on (1) 156 gal, (starting this weekend, was a 120 last weekend, but i upgraded!)
50% 1x a week on (1) 29 gal
25% 1x a week on my pond, aka non-working hot tub
Its not as bad as it sounds, I use a bunch of hoses, manifolds and a pump to do it all.