Your data is refreshed in 2 different cycles:

Campaigns, adgroups and ads data is updated daily.  The daily update takes place during the very early hours of the morning (relative to each adwords account's timezone).   You can see the time an account had its last daily update as shown below:

Keywords, search terms and landing pages are updated weekly. However, you can request an earlier refresh (if needed) by using the option below which is shown in every screen: