0 is neutral
10 is maximum positive
I am a 6 right now and last week I was moving between 2 and 8. In the last 3 months my most negative was probably around -6.
[Background] I find this question to be way more insightful than "How are you?". It sparks conversation about the current base level and events that were outliers into the positive or negative direction. It's also interesting to ask at work in order to see how much the current atmosphere is resonating with scarcity (distress, fear, overload, ...) or abundance (eustress, gratitude, positive challenge, ...).