Guidance on submission rate (i.e. number of photos submitted)

Is there any guidance on submission rates?  That is, how many images do people generally submit per week, say? 

I ask because I'm no Ansel Adams, so it doesn't bother me to have 99% of my images rejected, but I don't want to annoy the moderators either.  Currently I was looking at submitting my best image of the day.  Is that too much/little (understanding that everyone is different)?

Thanks

Andy