Mine is 19 × 4.5cm
Size is okay, but the rest must fit, otherwise the size of nothing brings.
I get envy!
Mine is smaller; ... but diligent like a ziskig!
The duration, tactics & steadfastness brings rather points (after the prelude), as a "trunk", which already hangs in the 1st sneeze; -)
Is sufficient, but could be more. Think you will arrive quite well.
Less is sometimes more ...;)
The best size is that fits.