No light drive! Thats old fashioned advice from when engines had big build tolerances.

Most of the engine run in will happen in the first hour. If the dealer drops the engine in, starts it up, then walks away and services another car while it idles up to temperature before checking for leaks, you wont ever bed those rings in 100%. Never.

The rings arent the same shape as your cylinder. They wear in by being pushed out against the hone marks of the cylinder. They push out under combustion pressure. Stands to reason that there is no point being a pussy waiting for the hone marks to dull and then give it a boot to try and bed the rings in properly.

When you get the key drive out of the dealer at half throttle. Dont let it idle, dont let it sit at any set rpm. 2500 to 4000rpm. After 2 minutes drive it at 3/4 throttle and 5000rpm 1 minute later give it some full throttle. Dont at any time use the engine revs for braking.

Its all out there on the internet.