In the case that the depth becomes too large cant we limit it to the distance from the surface to the core of the planet or a bit above that? That way we can at least get a more accurate value for it.
I mean Enies Lobby for sure hasn't been filled for 2 years. We can do at least that much right?
Let's assume a hole width of 2 km.
That gives an area of 3,141,593 m^2.
Using a velocity of 9.81 m/s.
3,141,593 * 9.81 = 30,819,027.33 m^3/s
30,819,027.33 * 25,246,080,000 = 778,059,629,495,366,400 m^3
Height = Volume/Area
778,059,629,495,366,400/3,141,593 = 247,664,044,800 m = 247,664,044.8 km
Current Blue diameter is
1,576,323.92381 km.
Lets do one for 2 years.
30,819,027.33 * 63,115,200 = 1,945,149,073,738,416 m^3 = 1.945149073738416×10^21 cm^3
1,945,149,073,738,416/3,141,593 = 619,160,112 m = 619,160.112 km
(1.945149073738416×10^21) * (25,700) = 4.999 × 10^25 Joules = 11.95 Petatons of TNT (Multi-Continental)
Possibly higher depending on the width of the hole.