Surname is 4 letters, starts with L. The middle is an honour name… is it too long? The other option I have is simply Adelaide Tina. Which do you prefer?
Thank you. 
Okay, here’s my thoughts.
So [name_f]Adelaide[/name_f] [name_f]Valentina[/name_f] isn’t long, it’s just hard to say, especially with that long vowel sound. Objectively, they’re both lovely names, but they’re flow together isn’t super awesome.
As for a choice between [name_f]Adelaide[/name_f] [name_f]Valentina[/name_f] and [name_f]Adelaide[/name_f] [name_f]Tina[/name_f], I picked the former because [name_f]Adelaide[/name_f] and [name_f]Tina[/name_f] don’t quite have the same vibes, and [name_f]Tina[/name_f] I don’t love.
Maybe instead of [name_f]Adelaide[/name_f] [name_f]Valentina[/name_f], just [name_f]Adelaide[/name_f] [name_u]Valentine[/name_u]?
[name_f]Adelaide[/name_f] [name_f]Valentina[/name_f] has flair and elegance!
It’s an honour middle name so flow doesn’t matter to me. [name_f]Tina[/name_f] is the honour name so [name_u]Valentine[/name_u] won’t work. Thanks though!
Not too long at all! I love long names. 
Also, I think the flow of [name_f]Adelaide[/name_f] [name_f]Valentina[/name_f] is beautiful. The name is just bursting with elegance!