"This usage meter provides an estimate of your usage only and may be running up to 6 hours behind."
I always assumed it meant traffic may not show up on the usage meter for up to 6 hours, but that when it did show up it would be categorised under the correct date/time. However it seems I am wrong...
Case in point: I downloaded ~2.5GB from around 8 - 9:30pm on Wednesday as it was the last day of the billing cycle and I had ~3GB allowance left.
Looking at it today though, the traffic shows up as have occurred at around 4pm the following day (Thursday)! i.e. I have eaten 15% of my current cycle's 20GB allocation already due to downloads that happened outside of the current cycle.
Customer support have told me that this is acceptable for them to do due to the clause mentioned above. I find this very disappointing. Also, the time difference here is way more than 6 hours (try 20).