We have limited the time period selection for retrievals from the Web User Interface (UI), in order to  improve the service performance but also to help the users to learn how to submit efficient MARS request

• We have limited the time period selection for retrievals from the Public Datasets web interface, in order to  improve the service performance but also to help the users to learn how to submit efficient MARS request.
• The Web User Interface is for sampling and browsing only.
• If you wish to download long periods of data we would strongly recommend you to use the Web-API and to follow the retrieval efficiency pages
• The current limits can be found on our News feed