Leave preamp on all day, off at night

Finally had the funds purchased my first tube hifi component, an arc ref 3. Very happy with purchase so far but has raised a concern. System is in main living room - wife and kids listen casually through day - non critical listening. I listen (more critically) for 1-2h at night when they are asleep.
Im used to solid state components that stay on all day long.
Question- is it a problem leaving the valve pre on most of the day, on most days of the week? Is it really just a matter of burning through the tubes faster,  or are there other expensive delicate components in there that don't like being left on all day? Thanks in advance