Its very nice feature to automatically publish posts within pick hours. You can arrange your posts to publish in Tumblr Queue in certain limit.
Tumblr Queue Limit
Yesterday, I got an ask about the limit of Tumblr Queue. Asker has asked me, “What is the maximum limit for Queue to arrange Tumblr blog posts?”.
You can queue maximum 300 posts at a time. You can’t queue more than 300 queue posts. So If you want to queue any further posts, You can put them in drafts.
Tumblr Draft is another best alternative for Tumblr Queue. You can store your blog posts in Drafts if you are exceeding more than 300 post limit in Queue.