How long does it take Adwords to update my bids/ads?

my ad isnt showing due to low ad rank because too low bid, so i upped my bid. does anyone know generally how long it takes adwords to show my ad?

It will take your ad's bid between 3-5 minutes to take effect and 1 business day if you made any changes to your ad copy (since each ad is submitted for review). If by "low ad rank" you mean quality score, you should work on increasing the relevancy of your keywords to your ad copy and your landing page rather than increasing your bid. Even if you meant your ad position is low, keyword relevancy and quality score can increase your ad position and even decrease your CPC.

By the way, there's also an Adwords sub-forum here.