Google isn't showing the full header

[zeus]

I wish it too that Google will update this things only within a day. But I don't blame them they have got billions of pages coming every couple of hours and also its increasing exponentially a the time is passing.

Now, coming to your question Google has specified limit for your headers its cannot be long then that. Some would say its the number of characters (which is usually between 70-75) but I will say that its the length of each characters combined. As if your title contains more character like 'i' or 't' then it can store more characters rather than 'w' or 'm'.