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It is possible that Baidu has found people abusing this submission service and that they are no longer taking action as quickly. Submitting your site multiple times could target you as an abuser of their service.
The standard SEO advice for several years now has been not to submit your URL to any search engine. The best practice is to get links to the new website and let the search engine spiders find you on their own.
This is however, at complete odds with Google's own advice which is that you SHOULD submit URLs to Google for indexing - ideally through regularly updated site maps!
Perhaps Baidu has a similar approach?
Matt
Submitting URLs to the SEs used to be a big game. We even had an entire forum devoted to the topic: Search Engine Submission [webmasterworld.com], but that was deprecated in 2002.
If you are going to use the URL submit of any SE, just submit once and leave it alone. Multiple submissions could trip their spam filters.