The main issue is we do not currently have a set definition of a time span that spam can be defined as. Currently, we have our Moderators mute anyone who says the same message 3+ times, and we leave the determination of how long it was between each message to that individual Moderator. Soon in the future, we will have a set time span, but to be safe, if you're unsure if you're spamming, you shouldn't. Say your message once, go to your server, come back in 5 minutes, that's what I recommend at least.
Also if you have a problem with a staff member (I noticed you pointed out fjsu) you should contact a Sr.Mod.