Hi Girls and Boys!

I've just read it somewhere now that in order for the Kelly Criterion to start having a positive effect (growth) on your bankroll You must apply Kelly in the following way:
Small BR: Full
Large BR: Half
Mega BR: Third

My question is that what would you consider a small bankroll, a large bankroll and a Mega (huge) bankroll in terms of numbers?

Thanks for any input

All the best