If you are sure you'll be in the game exactly once the four timer is ready to play again there is no need to tap them but I'd say it's best you do anyway so you don't get any lag from having them swar...
I might tap a few odd ones but usually if I can get into my game every 4 hours to play the polyvac then I dont bother. First thing in the morning I usually tap a few rambling robots before I play just to be sure I get them all
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