delayed_writer: change it for common values
delayed_writer: change it for common values

Make this effective for resolution starting at 40min. In
the future the delay should probably be a function of the precision
with a fixed max.

iksaif/biggraphite,iksaif/biggraphite,criteo/biggraphite,iksaif/biggraphite,iksaif/biggraphite,criteo/biggraphite,Thib17/biggraphite,dpanth3r/biggraphite,Thib17/biggraphite,Thib17/biggraphite,criteo/biggraphite,Thib17/biggraphite,criteo/biggraphite