Here are the parts
Replacement parts for WHIRLPOOL LER4634EQ1 | AppliancePartsPros.com

Here is the wiring diagram
http://www.servicematters.com/d...0Sheet%20-%203406688.pdf

I replaced everything except the timer , element, thermostats, fuses etc and it still takes too long to dry.
Sorry but found this confusing so do not really know what you replaced.

Is it possible that the timer is messing up?
I doubt it as the timer should not effect actual dry time.
One thing it might do is keep the thermostat's internal heater on all the time which would keep you in a low temp mode.
There is one thing to be aware of. In Auto modes the timer gets power through the heater when the heater shuts off so if the unit never shuts off the timer will not advance. This can be caused by a number of things.

Maybe stuck on the low heat selector even when I select the high temp?
Try the following it will let you monitor air flow and temperature.
Note that the most common cause of long dry times is the vent system.
Undo the dryer from the exhaust
Run a load
If the load dries correctly then you have a vent problem.
Clean/check the vent system. Make sure the outside louvers open fully.

If you do not want lint in the house.
Take a pair of pantyhose, put one leg into the other and attach this to the dryer exhaust.
Leave enough room behind the dryer so it can blow out like a windsock.
Run a load.