Permanent open farm

I’ve just recently started playing Stardew Valley and my girlfriend is playing with me in my Co-op farm. But sometimes for me it gets boring and I want to switch games but on the other hand my girlfriend is always productive on the farm.
I just wanted to know if there’s a way to have my farm permanently open to friends so that my girlfriend can join at her leisure without having to ask me to play which we both find somewhat tiring/repetitive.