There is a lot of controversy around re-using leftover rice. The way I look at it is that people are not as careful handling rice as they are handling other sensitive food because they think: “But, it’s just rice!”.
Just make sure that any unused rice will be quickly cooled down and stored in the fridge for a couple of days. You can then reheat once for a hot meal or use cold in a salad.
Alternatively, leave it out for the birds. They won’t thank you but they will love it.