This is clearly a question for the Limeservice.com Support and not the Limesurvey.org Forum.
However, I guess I can shed some light anyway (but I am in no way involved with Limeservice, so better to confirm with them).
The number of questions don't matter. What matters are filled questionnaires.
..when an administrator submits a response using the data entry feature
Sounds pretty clear to me. If you use the data entry feature and enter your responses via this tool, you are also charged per completed questionnaire (response doesn't mean response to 1 question, but a responded questionnaire).
when an administrator marks an incomplete response as completed 0.5 of a response will be counted.
In the backend, you can mark responses as completed, even if the system didn't mark them as completed. Example: someone gets to the last page but doesn't submit the survey. This is an uncomplete survey. But if you would like to consider it as completed, you can mark it as complete and then obviously you also pay for it as a complete.
To your example: if 220 participants fill out the survey, you pay for 220 participants. However, if someone starts the questionnaire and stops in the middle (does not complete the survey), it seems like you are charged for 50% of a survey.
Assuming that everyone who starts the survey finishes the survey means that you get charged for n=220 complete responses. If everyone of those n=220 completes the questionnaire 4 times, you'll get charged 4x n=220 = 880 responses. Now you need to see if there will be a certain amount of respondents who will start and never finish. Those will be charged as 0,5 responses (so what I understand you will be charged half a response.
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