No, it can’t ;).
It used to be 12 hours but is set to 7 days now. Of course - this is the MAXIMUM time - in average, it is 3.5 days - and it is set in this way to lower the requests on our download servers.

For example: If you get the size of the last update (4.1 → 4.5) and multiply it by the number of active users, you will get nearly 10 TB of downloads - quite impressive number ;D !

You can of course update immediately = manually.

Pavel