Tools in Microsoft Advertising for creating, editing, and optimizing ad campaigns
Good Morning Steph,
Yes you are correct on the limites. Per our help site FAQ: Remarketing in Paid Search
When you create remarketing lists, you specify what user actions on your website qualify them to be part of the remarketing lists.
When users perform qualifying actions, they are added to the remarketing lists within minutes. If the remarketing list minimum size of 1,000 (minimum cookie pool) is met, and you have associated the remarketing list with an ad group (including ad group exclusions) and set a specific bid amount, the ad delivery engine will start serving remarketed ads to those users on the Bing Network.
Note our reporting pipelines are slower and take one day to reflect the list size. When you create their remarketing lists, we try to provide an estimation of the list size in the first 6 hours based on some sample data. The data is then replaced with the actual list size when the reporting pipelines execute.