David Eduardo wrote:

The standard daypart is 7 to Midnight.

Using the 6th largest city, Houston, as an example, between 7 PM and
midnight...as a percentage of all persons, whether using radio or not, it
is 0.6%. In 18-34 year olds, the share is 0.4% of all persons
in that age group, whether listening or not.

Thank you. That's what I wanted.

For comparison, television pulls over 70% of all persons during 7 to
midnight. Any idea how many of that 0.6% of primetime AM listeners
are listening via skywave (non-local)?