I had a silly math problem in my head, so I thought I'd let you know:
- 30m tonnes ice = 30,000,000 m³ water
- Earth's surface = 510,000,000 km²
- Ocean's surface approx 2/3, so 340,000,000 km²
That's 0.088m² or 88 Liters fresh water / km² / hour, which adds 88nm to the sea level each hour, or 0.77mm each year.
I think, feel free to check :)