I will say that with Memorial Day upon us, many neighbors have been opening over the past week and I nosily asked around. Many opened to green and by visiting pool store or having a service come out, turned blue and clear within 4-7 days.
I followed TFP's closing procedure & opened with a clear pool. I quick vacuuming to get rid of dead bugs & letting the skimmer run for a few hours is all it took. If the water had been warmer I could have been swimming within a few hours of opening.
The fact that you needed floc/clarifier may indicate that your filter needs some attention. Do you know what type of sand is in the filter? Have you tried deep cleaning?