yes you can, but not adding numbers with text in the same cell
Excel Workbook |
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| B |
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5 | 1 |
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6 | 1 |
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7 | 1 |
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8 | 1 |
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9 | a |
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10 | a |
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11 | a |
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12 | 1 |
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13 | 1 |
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14 | 5 |
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15 | * |
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why not put a comments field so they can put hours in one field and text in adjacent cells
edit: you might want to put a text validation on the field for time to force that only numbers are used