What do you think of this solution?:
Go to Start, All Programs, Accessories, System Tools and run Task Scheduler.
In the left pane, click Task Scheduler Library.
In the right pane you’ll see two GoogleUpdateTask entries.
Double-click one and click the Triggers tab.
Double-click the trigger’s Description to open the Edit Trigger dialog box.
Set it to Weekly and pick a day.
If Repeat Task Every is checked, uncheck it.
To completely disable all Google Updates, uncheck Enabled at the bottom of the Edit Trigger dialog box.
Now Ok all that and then do the other one.
Now Google will check for updates once per week, not once per hour!
When it does do an update, you’ll have to fix this again.
If you turn updating completely off, you can make it check for updates manually by clicking the Wrench, then About Google Chrome.