Don't beat yourself up about accepting the job - it was the the employer's responsibility to paint a realistic picture of the duties and establish a good fit so

Don't beat yourself up about accepting the job - it was the the employer's responsibility to paint a realistic picture of the duties and establish a good fit so as to avoid this situation. Hand in your notice now and move. You can probably not even mention this role in interviews, because your previous long-term role is still recent. If you find another long-term job you like, you can just leave this as a small gap on your CV, or explain it away as some traveling time, sabbatical, etc. Leaving after six or twelve months is a bit harder to explain away and looks more like job-hopping. Obviously be as nice as you can about this, offer to help find / interview your replacement, etc, and hopefully they'll return the favour by letting you get to interviews during the day and being flexible with your notice period.