I own many ferraris and get a bag of mixed.

Livingin a dry climate like yours I would go no longer than 5 years driven or not. Or always have one with you incase it does break then replace it roadside if you have too. Whatever the cost of the blet is much cheaper than an engine. Especially a ferrari as they are not cheap.

In a normal car replacement is called fortiming belts is 60,000 miles along with tensioner, but in your car i'd go 5 yrs then have the guy check it to see how the rubber is doing wheteher it looks deteriated or not. He would be able to tell. I understand your concern. You might ask if this is a n interference motor or not, because if it isn't the valves won't hit the pistons so if the belt broke you would still be ok, just have to go through the belt replacement. If it's an interference motor then you wold be in trouble.