I'd argue, that meditation works best when treated like learning to play an instrument or doing sports. Regular practice is where the most benefit can be reaped. Doesn't have to be every single day, but it should be regular. Don't do it once a blue moon and expect any tangible benefits.
For people trying out, there's no need to do it everyday. Don't be stressed out with missing out on your meditation schedule.
Meditate when you can. It's not a race. There is no sculpted body to show off after rigorous workout regime at the gym. It's just for yourself.