My experience is < 5 days is not enough may have been due to using a hop bag that floated also. Im doing a week and half to two weeks currently with loose pellots and floating hop bag.I need to get marbles or a tea ball.But its still pending for me.to see the differnce.Ive cold crashed only 12 hrs to a day and that worked enough to settle the hop pellot flakes.I think its unnessassary to cold crash that long, i just want enought to settle the floating hop pellot flakes.