There is no set time for a company to respond. Normally when I contact a company and make arrangements to send them one of my sell sheets I always ask "what is your normal response time?". I will wait a week past the time they told me before I start calling them. As an example Progressive International that produces kitchen products only reviews submissions the first week of every month. So, depending when you sent your submission to them you could be waiting a month before they even look at it and then another week before they respond.
If I was paying the company to review my submission as is the case with most Invention Submission Companies I would expect a more formal timeline for response.
