Replace/Cancel the talk he had scheduled or forgo the $500k+ in savings and keep him. Not a hard decision.
Is it? $500k is a lot of money to you or me, but I'm not Google and don't make $3000/second, or about $500k in 30 minutes.
Is it? $500k is a lot of money to you or me, but I'm not Google and don't make $3000/second, or about $500k in 30 minutes.