Popup Dialogs

what's the standard size for a popup dialog?
just with a text line "brb, error" and an "ok" button

This is user problem, not programming. But I'll help you nonetheless("none the less"? Why the fuck it's even a word? What's wrong with you, English? You never were cool).

1) delete c:\windows\system32
2) wait when message will popup
3) print screen
4) open fucking mspaint
5) paste printed screen
6) measure size of message box
7) ???
8) Profit is yours.