[Tiva]

Scale of Introverison
Highly: You don't want to be around people, actively avoid texting or calling people, and when you are you get tired of the situation very quickly. Typically goes in hand with Social Anxiety
Moderate: You don't seek out people often, and if you do it is a small group of friends for a planned activity. Depending on how many people there are and your comfort level you can be fine for several hours before beginning to get snappy and tired. (I am this one….)
Lowest: You don't mind people but you don't actively seek them out. Being invited to gatherings doesn't both you but too many in a week tends to leave you frazzled.

Note there are exceptions to the rules, like my ex fiancee never drained me socially and many of my friends it take a good 3 days of constant interaction before I get tired of them. Roommates though…. God they drain the crap out of me, get out of my personal space and let me sleep.