<ol>
<li><p>You should generally ask questions separately unless they're very closely connected (in a way that it's natural to answer them together). Posting laundry-list questions will get your question closed.</p>
</li>
<li><p>You should be okay posting a several questions a day, but the people best placed to give good answers may only have time to look at one or two, so the more you post at once the more likely that you'll miss an opportunity for a good answer (i.e. if you post 8 in a day, that may work out less than optimally).</p>
<p>I'd suggest keeping yourself to about 2-3 a day and I'd suggest spacing them out by a reasonable interval (half an hour to an hour, say), to get a good chance of an answer or two on each.</p>
</li>
</ol>
