Doing something every day depends on the criticality of your application. If it MUST happen exactly at the same time each day, then accurate crystals or RTC's are the way to go. If it's arbitrary (eg just running a waste pump that's clearing your sewage pit each day into your neighbours swimming pool) and it doesn't matter if it's plus or minus a few minutes, then a simple loop counter would be just fine.

I use a 16F628 with internal oscillator in an application that times about fourteen months... my accuracy is about plus/minus six hours across that period.