Kenmore 400 Series electric takes ver long time to dry.

Very common problem. You need to call a
duct cleaning company and tell them to clean
your dryer vent. Rule-of-thumb: dryer vents
should be cleaned every couple of years to
prevent them from being clogged with lint and
causing lint fires. This is definitely your problem. Good luck :)

p.s. one way to verify a clogged vent is
to go outside where the vent exits the house
and feel the air-flow. should have adequate air-flow.