[H. J. Simpson]

A good idea is normally not to switch the pronter off entirely, instead, let it
sit in standby if not needed ... this way, the printer can go into a cleaning cylce

if it feels like it.

I'm pretty sure Epson L800 won't go into a cleaning cycle by itself. It'll only start head cleaning after some user interaction, otherwise you can leave it on for months and it'll just sit quiet doing nothing. At least that's how Epson T50/P50 operates, and L800 is basically the same printer with a CISS from the factory.

 

When I use it on daily basis, evertything goes fine, whenever I leave it for more than 2 days without using it, I have to clean the print heads, is that normal ?

Epson used cheaper inks for L800, it's not the same Claria inks used for the previous models with the same print head (T50 etc), so while I'm not 100% sure it's normal (for that you'd need to ask other L800 owners), I'd say it's not surprising that it clogs a little after a few days.