electric cooling fans

[PAINTRIX@aol.com]

I have a 78 mgb with the electric cooling fans.  I have not had any troubles
with it except when I drive up to a group of other lbc people.  They are all
amused at how long the fans run.   Depending on the air temp the fans can run
for a good 10-15 minutes after turning the car off.  There has even been
times when the you can hear the battery run down as the fans are running.
Question is how long should the fans run???
thanks in advance
steve petrosky
cinti, ohio