That's a good question @Sunnyside226
1.The SANE helpline is very similar to us here on the forums, where it's okay to talk about thoughts suicide and self-harm, but if you are not currently safe and have any plans to act on those thoughts then Lifeline and Suicide Callback service are the places to call.
2. Just like us, they have a duty of care, so if you tell them that you are in danger then they might need to call emergency services. As long as you let them know that you're safe and you're not wanting to act on any thoughts of suicide there will be no need for them to call the police or ambulance.
3. The times of the calls can vary, but they're usually around 20-40 minutes
They're there to talk about lots of different mental health stuff, they give support and information and resources.