What is the refresh interval of MtGox ticker API? I'm using the MtGox ticker API (from MtGox API V2) and I want to know the update interval. I think it is less than 3 minutes, but is it possible to know exactly? It is important to me because I'm developing an Android app that shows the current price to the user in notification bar.
if you want fast http ticker use the new fast_ticker : 
http://www.reddit.com/r/Bitcoin/comments/1c9npl/mtgox_fast_ticker_last_only_no_rate_limit_1second/

http://data.mtgox.com/api/2/BTCUSD/money/ticker_fast

and you will get 1 second only cached minimalist ticker ( last )

if you need more ( low, high, volume ) you have the normal ticker, most probably cached 30 seconds :

http://data.mtgox.com/api/1/BTCUSD/ticker

the new data.mtgox.com is behind cloudflare now and the only ratelimits you will hit will now be cloudflare anti dos limits

old api urls not using data.mtgox are now deprecated and not guaranteed to work