Time schedule wouldn't be a reason I'd switch to Levemir. And I don't think the 2 hours would be best handled by an insulin switch. I think that's too much for Lev, depending of course how well regulated the cat is. Can you make up the time the previous days so that Tuesday morning is two hours early, then you go back wards in shot time after that? I had a monthly board meeting where I had to leave home about +11, plus I had lots of regattas (events) where I had to shoot a couple hours earlier. I would just spend the days before hand moving the shot schedule up, then move it back after.
The Lev cost depends where you live. It was about $10 more than Lantus for a 5 pack of cartridges here - so nominal, but that's Canada. The dose may or may not be the same eventually. We suggest starting at 70% of your Lantus dose - as some cats have a strong reaction to the switch in insulin. Ultimately, some need more, some less, some the same. ECID.