Frank formulated the question :
On 11/30/2016 5:45 PM, FromTheRafters wrote:
micky explained on 11/30/2016 :
How long does it take a microwave oven to warm up?

The energy transfer is nearly immediate. The oven only warms up because
of the food warming up.

Some items which I microwave would end up having cold or cool spots, so
I used to cook say a three minute item by cooking for two minutes and
then allowing the heat to spread for a couple of minutes, and then zap
for another minute or so.

I now have a new microwave oven with a turntable (the other had a
reflector) to help avoid the spottiness. The ovens power output is also
an important factor to consider.

I find it easier to microwave for longer periods of time at a lower setting
to get even heat.

Yes, the new MW oven has programmable settings for power level and rest
periods and such for better results. The old one only had a single knob
with minute marks on it and a bell that softly, almost inaudibly, went
'click' when the time expired.

The old one is 26 years old, but it still works.