Not sure if I understand the question correctly, but your vote will be counted for 10,000 blocks, which corresponds to roughly one week.
You can see in the transactions tab when you minted a block. However, if you are using a data feed and your voting may change without notice then there is currently no wallet feature that easily allows you to analyze this. You may want to take a look into the RPC API which allows you do perform this analysis (but it involves scripting).