They could, for sure. But it’s up to you whether you want to just take on extra work with no increase in money or benefits. They could give this duty to someone else, or hire someone else to do it. Or just tell you that it’s mandatory that you do it.

They might not want to pay you any more money, but even a day or two of extra vacation is a win for you and likely easier for your supervisor or whoever to get approved.

If you don’t say anything you could end up in a scenario where you’re getting more and more work added to your plate because you’re a “great team player”. But what’s the cost of all that extra work on you? Longer hours? Working on weekends? Unpaid overtime? More stress? Burnout?

You can make the argument not to rock the boat, but you also don’t want to be the doormat everyone walks all over because they never stand up for themselves.