SQL & PL/SQL :: Execution Of Blocks In Oracle

I have a block of code that looks something like this, I'll write it in pseudo code to avoid pasting 100's of lines of

IF <condition> THEN
FOR record in (select query here..)
LOOP
--add data
END LOOP
END IF;

IF <condition> THEN
--do soemthing
END IF;

IF <condiiton> THEN
--do soemthing
END IF;

Now, in the 1st IF statement there is a for loop which basically builds up a tab type array - this takes at least an hour to execute based on the select query which returns 1000's of records.

The strange thing is, that my log files shows that at the time the procedure was executed, the stuff in the 2nd IF statement was executed almost straight away.. is this even possible?

If the loop in the 1st IF statement takes over an hour to finish, how is it possible for the 2nd IF statement stuff to process straight away? My log files show me that the loop in the 1st IF statement was going on for a good hour.. yet the 2nd IF statement was executed straight away.