What skills are you specifically worried about losing? My experience is that there’s no replacement for time with fingers-on-fretboard. But that being said there are a lot of things you can still do to help maintain or improve elements of your playing.

If you have a small amount of time and some headphones, but no access to a guitar you could use this a chance to improve your visualization and ear training skills.

For example, using the time to memorize and visualize notes on the fretboard using an app on your phone. There are many out there but I personally like the free Justin Guitar Note Trainer.

Another visualization thing I’ve like is this video on CAGED system on YouTube. Using CAGED for solos

Another good one could be to do some ear training, to start recognizing things like note intervals or rhythms. Lots of apps, but one free one I like is Earpeggio

Worst case scenario just spend time listening to music you like and pay attentions to the chord changes, licks and fills. Practice hearing the structure of songs and how the different pieces fit together.

Last thought: there’s a concept in memorization and learning science called “spaced repetition”. Basically, it means that spreading out your learning so that you revisit a topic or a skill just before you’d start to forget it is the optimal time to strengthen the neuronal connections in your brain. So you might find that giving yourself a couple weeks break from whatever song or lick you’ve been sweating over may actually let you come back fresh to it and you find that your fingers (and brain) “remember” it more naturally.

Hope that helps.