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Prolonged contact with the skin is defined as contact with the skin to articles containing nickel of potentially more than
- 10 minutes on three or more occasions within two weeks, or
- 30 minutes on one or more occasions within two weeks.
The skin contact time of 10 minutes applies when there are three or more occasions of skin contacts within a two-week time period. The skin contact time of 30 minutes applies when there is at least one occasion within a two-week time period.