Marketplace API update frequency

[cfitz25]

Feature Description

Put how often the marketplace servers plugin database is updated in the plugin description and have the plugin say when the database last updated.

Why is this feature needed?

Some of the plugins i am using have an update on the site but when i update with pluginportal it says everything is up to date. So it would be useful to know what the lag between database updates is.

Additional Info

No response