The Shift-Swap Email
You are the shift supervisor at a 24-hour warehouse. On Thursday at 4:10 pm, a colleague, Dana, sends this email: "Hi - I can't make my Saturday 6 am to 2 pm shift because my sister's wedding is that morning. Can you cover it? It's just one shift and I'd owe you. Sorry for the short notice." You are already rostered for Saturday 6 am to 2 pm. You could work a double (6 am to 10 pm), but you have a driving lesson at 11 am and a medical appointment Monday morning. Your manager's rule is that all shift changes must be confirmed in writing at least 48 hours before the shift starts. It is now Thursday 4:10 pm. The Saturday shift begins at 6 am.
1. Dana's request arrives at 4:10 pm Thursday. Using the manager's 48-hour rule, calculate whether a written change can still be accepted for the Saturday 6 am shift. Show your working.
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The shift starts Saturday at 6 am. Forty-eight hours before that is Thursday at 6 am. Dana's email arrives Thursday at 4:10 pm, which is 10 hours and 10 minutes after the deadline.
So the answer is no: the 48-hour window has already closed. A written change now would breach the manager's rule, even though the shift is still more than a day away. The key trap is assuming "two days away" means the rule is met; the rule is measured from the start time, not from the day. If Dana wanted a compliant swap, the request needed to reach you by Thursday 6 am.
2. Assume you decide to help Dana anyway. Write a short reply (3-5 sentences) that accepts or declines, states the practical constraint, and proposes one workable next step.
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A strong reply is clear, warm, and specific:
"Thanks for letting me know, Dana - I understand weddings can't move. I can't take your whole shift because I'm already rostered 6 am to 2 pm that day and I have a driving lesson at 11, so a double isn't possible for me. Because your email came in after Thursday 6 am, a formal swap now would break the 48-hour rule. The best next step is for us both to message the manager tonight and ask whether an exception can be approved, and I can cover 6 am to 10 am if that helps."
Why this works: it names the constraint (lesson at 11, double not possible), explains the rule without blaming Dana, and offers a concrete action (contact the manager, partial cover). A reply that just says "no, sorry" leaves Dana stuck; one that promises to cover the whole shift creates a new problem on your side.
3. Dana's phrase "I'd owe you" is vague. Rewrite the offer as a specific, checkable commitment - or explain why you would not rely on it.
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"I'd owe you" cannot be checked, scheduled, or enforced, so it is not a reliable basis for agreeing to a 16-hour day. A better version is specific about what, when, and how it will be confirmed, for example:
"If you cover my Saturday 6 am–2 pm shift, I will cover your Sunday 6 am–2 pm shift and confirm it in writing to the manager by Friday noon."
That version names the return favour, the date, and the confirmation channel, so both people and the manager can see whether it happened. If Dana cannot offer a specific swap, you should treat the request as a favour with no guaranteed return and decide on that basis.