That's exactly the wrong approach in my mind.
I'd program an hour something like this: (If you're really a radio person you can play bits of each song in your head and get a feel for the music flow)
Sinatra "NY, NY"
Manilow "Copacabana"
Billy Joel "Just the way you are"
Supremes "Where Did Our Love Go'
Dean Martin "Everybody Loves Somebody Sometime"
Beatles "Can't Buy Me Love"
Kenny Rogers "The Gambler"
Ben E King "Stand By Me"
Gladys Knight "Neither One of Us"
Astrud Gilberto "Girl From Ipanaema"
Tony Orlando "Tie A Yellow Ribbon"
John Denver "Country Roads"
2nd hour:
Tony Bennett "I Left My Heart in SF"
Carpenters "Close To You"
Temptations "My Girl"
Albert Hammond "It Never Rains in Southern California"
Sinatra "That's Life"
Neil Diamond "Sweet Caroline"
Helen Reddy "I Am Woman"
Lionel Richie "Truly"
Dionne Warwick "Do you Know The Way to San Jose"
Beatles "Love Me Do"
Jay & The Americans "Kara Mia"
Yes, some core artists are on a about a 90-minute rotation.
The average song in that mix is about 35-40 years old. All big hits, all totally familiar. You might hear some of the songs next week on American Idol. You could probably play in excess of 600 songs, maybe as many as 1,000.
Now I never listened to WDUV, maybe this is close to what they do, maybe not. But this is what I think it should sound like.