adjective
BAD : The phrase 'the role of women' appeared just several years ago.
GOOD : The phrase 'the role of women' appeared just a few years ago.
BAD : Try to forget your work for several hours and relax.
GOOD : Try to forget your work for a few hours and relax.
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Several means 'some but not many': 'Chicken will keep for several days in a refrigerator.'
When you are talking about a very small number, use a few : 'He was here just a few minutes ago so he can't be far away.'