You should report accidents to your insurance company within 24-48 hours. While policies typically require "prompt" notification, most don't specify an exact deadline – but the sooner, the better.
For liability claims against another driver, Nevada's statute of limitations gives you 2 years from the accident date to file a lawsuit for property damage, and 2 years for personal injury. However, don't wait – memories fade, evidence disappears, and witnesses become harder to find.
Best practice: Report to your insurer immediately (within 24 hours) even if you're unsure about filing a claim. Late reporting can give insurers grounds to deny coverage.