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Every 4 to 5 weeks.
14% (53 votes)
Every 5 to 6 weeks.
44% (169 votes)
Every 7 to 8 weeks.
28% (109 votes)
Every 2 to 3 months.
7% (27 votes)
2 or 3 times a year.
3% (10 votes)
Only as needed.
3% (12 votes)
Never.
1% (3 votes)
Total votes: 383
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