All credit goes to Lina Shields.

So, based on this calc here, the minimum impact velocity of any meteor that approaches the Grand Line is about 170.8km/s. We will use the low end for the meteor speed, just to be safe.

Said calc is based on this calc, so credit to CinCameron20.

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Step 1: Meteor Diameter

Law's height = 10px = 1.91m

Meteor diameter = 73px = 13.943m (radius = 6.9715m)

Meteor speed = 170,800 m/s

Meteor mass = (Volume = (4/3)*(3.1416)*(6.9715^3)) x (Density = 3000kg/m^3) = 4,257,842.325 kg

Meteor KE = 0.5*(4,257,842.325 kg)*((170,800 m/s)^2) = 6.2106e16 Joules; City level

Law cut said incoming meteor in half, so Law scales to this.

Step 2: Doflamingo Stats

Doflamingo height = 214.33px = 3.05m (scaling from Luffy's height?)

Doflamingo arm length = 123.8px = 1.762m

Doflamingo height = 250.46px = 3.05m

Doflamingo head size = 23.35px = 0.2843m

Step 3: Angsizing Meteors

1 rad = 57.2958 deg

Distance from POV to Doffy's head = 2atan(tan(70/2)*(19/600)) = 0.03 rads, or 1.71922 deg

Size = 0.2843m

Distance = 9.474m (Distance from Doffy to panel)

Since a part of the section of the meteor is only shown here, it would reasonable to say that half of the meteor distance was shown/covered between the panel and Doffy.

Thus, what I will do here is to find the distance between Doffy and the meteor (or half of it) before it was cut, as shown in the picture below.

Distance from panel to front of meteor = (9.474 - 6.9715)m = 2.5025m

The front of the meteor was at least 2.5025m away from Doffy's face just before said meteor was sliced into pieces.

Doffy height = 89.07px = 3.05m

Meteor distance = 41.23px = 1.412m

Meteor travel distance = 2.5025m - 1.412m = 1.0905m

The meteor moved at least 1.0905m towards Doffy's face when said meteor was sliced into pieces.

Step 4: Timeframe, Doffy's Speed

Timeframe LE = (1.0905m)/(170,800 m/s) = 6.38467e-6 seconds

Doffy's slash should be making 1/3 of a full circle, thus it moves 120 degrees (That is what I used for the Ryuko slicing the tennis balls anyways)

Circumference of a circle is 2*Pi*radius

Radius of circle in this case = Doffy's arms = 1.762m

Doffy makes two slashes, from the panel shown below.