Credit limit increase on a HELOC

[Dan B.]

How quickly could one request a credit increase to a HELOC?

For some background, I secured a HELOC, just a few months ago, against a rental property. I threw a large chunk of $$ at the principal, about the same amount as the HELOC. My question is what's a good rule of thumb for when I can ask the bank for a credit increase since the LTV is a much different amount than when I first got the HELOC?