Where to change data connection timeout and email check frequency?

[jagojago]

I set up my gmail account on my touch pro and initially set it to check every 2 hours. I have since changed my mind and I don't want it to check mail automatically at all, only when I press send/receive. I can't seem to find this setting though, where would it be located? Also a question on data connection, I had a data connection open for 3 hours today just because I had an email open and it drained my battery fast, where is the setting to have the data connection disconnect after a few minutes of inactivity? I have my wifi set up like this, but can't find the setting for the cellular data connection.