Tasker to sync Google but allow push notifications?

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http://forum.xda-developers.com – I figured out that I can set Tasker to sync my Google account at specific intervals so I can leave autosync off. I used "Synker" as a plugin. I have two questions left however: 1.) What is the default sync interval for Google if I leave it to auto sync? I don't want to make a shorter sync interval by mistake. 2.) How do I keep push notifications; I don't want to be unaware when someone sends me a message. (or do I even need to keep push notifications to know when someone messages me?) thanks (HowTos)