It's dependent on the piston material, piston design, and the intended use. The more heat in the combustion chamber the greater the expansion. The idea is when at operating temperature most of the clearance is taken up in expansion regardless of the piston material. Some applications will expand .006". Some will expand .002".

The piston design is important. The older TRW/Speed Pro pistons have a long oil drain slot under the oil ring groove that effectively blocks the heat from traveling down the piston into the skirt, thus the skirt runs cooler and doesn't expand much. This is why these forged pistons can be run tighter.

Other forged pistons have holes under the oil ring groove. These allow more heat into the shirt and the shirt expands farther in a similar application.

KB Hypereutectics have the holes in the oil groove, but the high silicon content doesn't transfer heat like a low silicon forging. These require less clearance but the head of the piston runs hotter and the rings will expand farther.

You should consult the manufacturer of the piston and be aware about the use of the piston.