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When the data collection starts is upto you.
Pending on the application and software in use, the data collection can be started immediately after the question slide is up on screen.
Alternatively you may want (us) to start the data collection manually (mostly by one more mouse click), because you want to make sure everybody has had the chance to listen to your additional explanations which you may want to give verbally as you read out the question.
If you are after "gut feeling" responses and on top do not want to allow second vote corrections, you should start the data collection immediately and keep it as short as possible by bringing up an optional timer.
As mentioned before, you decide when to start the polling (and obviously when to finish)....