The Pomegranate Effect
The Pomegranate Effect refers to the more realistic expenditure of time. Specifically, if a project should take 10 hours to complete, it will in fact take 30 hours due to the realistic expenditure of time. This use of x3 is regularly applied in this effect. The name originated from a project wherein an artist was painting a pomegranate for a 10 hour project which in fact took 30 hours.
Sculpting this should take me 2 hours, but factoring in the Pomegranate Effect, it'll realistically take 6.