I've been doing 530khash/s at least for several days now and this seems longer than I would expect and longer than the calculator would suggest on avg.
Just wondering if the difficulty has gone up or if there is anything I should check.
The difficulty is 22012 since Januari 27th. At that difficulty and hash speed, the chance of not finding a block in 5 days, is almost 8.9%. So you've had bad luck, but it's far from impossible.