Looks like by default, when not full screened PowerShell and Windows Terminal default to 120 characters wide. Full screen and terminals embedded in IDEs and the like give me: 187, 209, 236, and 237. That all depends on screen size, dpi settings, font size settings, zoom settings, etc.

Depending on the scripting language and the terminal host, there are usually a handful of ways to get this dynamically at runtime. .Net/PowerShell exposes this as [Console]::WindowWidth for most (but not all) hosts.

There's going to be wide variances in this, so I personally wouldn't target some static value of how wide you expect it to be. In situations where I can't just let the host's word wrap handle long lines or let the scripting language handle it automatically (PowerShell's $ObjectList | Format-Table -Autosize is nice for this), then I just I grab the current window width when I need it.

I have a few "for fun" scripts that do ascii art animations, and they check the terminal's height and width every frame, adjust the "image" as needed, then redraw at the current size.