There are many ways to deal with this programmatically, using plugins like PLEG or LUA code. However, if you wish to do this with a plain stock Vera; your best bet is as follows.
Configure your motion sensor so that the untrip timeout is 10 minutes(See motion sensor manual).
Bonus (after the above is working). You might want the receptacles turning on and off only at night and not during the day. You can create this additional condition simply by adding the following line of Lua code to the LUUP tab of each scene:
return luup.is_night() == true
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