R help - Aug 2003 - retrieve execution time form an array of datetime values

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Stored inside a mysql-db-table I've collected question-by-question response 
time for a survey. First solution could be:

1) estract with SQL query all fields (with NA values due the presence of 
question-filters and conventional jump)
2) handle data with [PHP, Perl, Python] to extract datetime fields to 
per-question response time in seconds and store time result for every record
4) plot boxplot over time response.

Are there alternative tips more R-related without extra-manipulation?
Is there a singular way to operate with R? Any package/function to help?

Thanks
- -- 
Daniele Medri
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