That isn’t long. So I agree that you should put all the text in if that is correct subtitle.
If you want a LOOOOOOOOONG title, try this Chumbawamba album (was a world record length… may still be)
The Boy Bands Have Won, and All the Copyists and the Tribute Bands and the TV Talent Show Producers Have Won, If We Allow Our Culture to Be Shaped by Mimicry, Whether from Lack of Ideas or From Exaggerated Respect. You Should Never Try to Freeze Culture. What You Can Do Is Recycle That Culture. Take Your Older Brother’s Hand-Me-Down Jacket and Re-Style It, Re-Fashion It to the Point Where It Becomes Your Own. But Don’t Just Regurgitate Creative History, or Hold Art and Music and Literature as Fixed, Untouchable and Kept Under Glass. The People Who Try to ‘Guard’ Any Particular Form of Music Are, Like the Copyists and Manufactured Bands, Doing It the Worst Disservice, Because the Only Thing That You Can Do to Music That Will Damage It Is Not Change It, Not Make It Your Own. Because Then It Dies, Then It’s Over, Then It’s Done, and the Boy Bands Have Won.
I think that is 865 characters long… hehe…
So I think you are well within limits that MB can handle.
I always say it is better to have too much information that too little.