> I'm a go-getter and want to help him out It's language trap. Go-getter is just a tag. It sounds nice, but in your context it just means "I'm ok with altering

> I'm a go-getter and want to help him out It's language trap. Go-getter is just a tag. It sounds nice, but in your context it just means "I'm ok with altering my personal life when my boss asks". Here are some more options if you are not a 'go-getter': 4. Ask your boss to delay the meeting so you have enough time to do the spreadsheet in your own time. 5. Ask your boss if the spreadsheet is absolutely necessary for the meeting. Given that there was no time to have the "proper" document done, would it be possible to have a "high-level" version only? Maybe I can send the complete spreadsheet after the meeting via email? 6. The last-resort option would be proposing compensation with free time. "I will arrive early and do the spreadsheet early, but I will leave after lunch / will not come to work on friday". Make sure that you earn personal hours here: if you arrive 1 hour earlier, you should leave 2 hours earlier. Don't accept more money for that overtime. In addition to those two options, start telling your boss (softly) that having you prepare a spreadsheet manually every week is not very productive. Propose spending some time automating the process so at least it takes 15 minutes instead of several hours.