The most likely early hour result of not breaking it in properly is increased oil consumption. You will know soon enough. It's called karma for thinking that you were only harming the lease company or future owner by not following the manufacturer's guidelines.

As others have said, Read the Manual.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue