I keep my toenails polished all the time. Granted, in guy mode I have them stuffed in shoes all day long, but as soon as I get home, off come the shoes and Hello Piggies!
It may be overkill, but here is what I generally do for them, and it usually lasts a couple of weeks until time to trim them again.
I start with either a base coat or some nail strengthener. Next a couple of coats of polish, then at least one layer (and usually 2) of top coat.
OPI is one of my favorite brands...I love the names they use..."I'm not really a waitress"..."Your a Pisa Work"..."Senorita Rose-alita"...and my favorite name "Nice Color, Eh?"
.....Laurry