It is not bad to not have runoff especially since you're not feeding with salts, but you want to water enough that will saturate the medium - And that sometimes requires watering to runoff just to make sure the medium is fully saturated and there are no dry, hydrophobic spits in the soil. I take about 30min to water my 3 blueberry plants...I break up the top soil, spray it with my pump sprayer (just to make sure it all goes straight in and doesn't run straight to the edges) then dump 1/3 of my water slowly around the top, then I dump 1/3 into the saucer so it can pull the water from the bottom and then about 15min later I go water the last 1/3 from the top again.