What is the difference between "tutar" and "sürer"?
Merhaba,

What is the difference between "tutar" and "sürer"?

for example when asking "how long does it take from here to Istanbul?"
"İstanbul'a buradan kaç saat tutar?" or "İstanbul'a buradan kaç saat sürer?"

Teşekkürler.

Question

What is the difference between "tutar" and "sürer"?
Merhaba,

What is the difference between "tutar" and "sürer"?

for example when asking "how long does it take from here to Istanbul?"
"İstanbul'a buradan kaç saat tutar?" or "İstanbul'a buradan kaç saat sürer?"

Teşekkürler.

Answer

There is no difference between "tutar" and "sürer" at your example...

"İstanbul'a buradan kaç saat tutar?" or "İstanbul'a buradan kaç saat sürer?"

in here both are the same...

Answer

Merhaba,
"Tutmak" has a lot of meanings, and one of them is "sürmek"
So in this context, they have same meaning. 
I recommend you to use the verb sürmek for this kind of sentences.