Working remotely from Illinois for a few months - Currently live in Texas

[taxcurious1]

I have been unable to find clear guidelines from Illinois about at what point you will need to file State Income taxes. I currently live and work for a company in Texas but am thinking about working remotely from Illinois for a couple of months to spend time with my parents (maybe even up to 6months). Is there a period of time of working from Illinois after which you do need to pay Illinois state income tax and before which you do not? I would greatly appreciate any help, thank you!!

I see some things online about a 183 day rule and some states have 30 day rules. But I couldn't find a clear answer for Illinois.