Some nouns have plurals that don t end in s , e.g., children . I ve got a week s holiday. I ve got six weeks holiday. They want 48 hours notice. The pronouns mine, yours, his, hers, its, ours, yours, theirs are already possessive, so don t use an apostrophe.
Students often use an apostrophe incorrectly when the word is a simple plural.
Rugby player s get well paid. Let s have a salad, potato s and pasta for dinner. All three are regular, common plurals with no Apostrophe s aren t difficult to understand. Sentences which are not sentences. Partly because for a long time it faced no real competition.