Mine took 6 months to settle in, but two months to eat. Then another time fasted for 5-7 months, don't remember exactly how long. I remember I knew he wasn't eating because I didn't see him and he wasn't as fat as he would normally be after a meal. Surprised me how little bit of weight he lost.
Wow and I thought it was the other way around! I was concerned about bring on vacation for 8 days. Thanks for the fun fact. Just makes me love fish as a pet even more now.