Quote from boltano on September 22, 2015, 12:48
I purchased something from AliExpress and on the date, 15th September 2015 it said "leaving gaunzhou airport" and I am very worried about my parcel because I'm sure it doesn't take 8 days to stay on transit.

Unfortunately, it does take longer than 8 days in transit on average. The median to the UK is 12 days and the longest on record is 40:

http://track-chinapost.com/China_Post_Arrival_Time_Stat.php

With any luck it should show up in the Royal Mail's system within the next 7-10 days and be delivered shortly thereafter, though again, it could be longer.

Quote from boltano on September 23, 2015, 06:54
How am I suppose to know it's been scanned the tracking information does not get updated regularly.

It's generally in a sealed mailbag or shipping container while it's in transit from China to the UK. Nobody could scan it even if they wanted to.

Quote from boltano on September 23, 2015, 06:54
I need to know where my parcel is I'm so worried

Don't worry. Worrying won't get it to the UK any faster.

In all seriousness, airmail has a lot of variance in transit time, as you can see here: http://track-chinapost.com/China_Post_Arrival_Time_Stat.php
If that much uncertainty in delivery time is making you anxious, you might consider paying extra for a service that's faster and more frequently scanned (like EMS), just for the sake of your peace of mind.