Final answer:
Hootsuite's Bulk Composer requires posts to be scheduled at least 2 hours in advance of the CSV file upload time.
Step-by-step explanation:
When scheduling posts using Hootsuite's Bulk Composer, you need to ensure that your posts are scheduled at least 2 hours in advance from the time the CSV file is uploaded. This lead time is required for the system to process and schedule the content appropriately in the queue. So, for example, if you upload your CSV file at 1 PM, the earliest your posts can start publishing is after 3 PM on the same day.