I have never considered texting my T when she's been on vacation. I've been more likely to call her voicemail and listen to her voice. Sometimes I leave a message, but mostly, I just listen. When she was on extended sick leave, she initially allowed me to text her, but things got out of control and that ended abruptly.
When I was very ill a few years ago, and in the hospital and then a physical rehab facility, she allowed me to text her (and she texted back), because I had neurological problems and was unable to speak.