On a site I'm working on, the import file is a bit large - 31MB. However there are much larger DBs than this one.
I get the error "Script timeout passed, if you want to finish import, please resubmit same file and import will resume." which is fine, and I can select the file and continue the import again. However, it would be appreciated if the script used some AJAX handling or auto-redirecting to avoid timeout issues.