How to get the difference between two timestamps in minutes?
After hours of searching over the internet, I was able to find a shorter version of the code that I was asking for. After several attempts of deriving the code I found here.

(CAST((SYSTIMESTAMP + interval '35' minute) as date) - CAST(SYSTIMESTAMP as date)) * 1440

Result: 

+--------+
| Result |
+--------+
|     35 |
+--------+

This version is faster compared to the version that uses EXTRACT. The only downside of this version is that it doesn't include fractions of a second.