Lima is 2 hours behind Santiago
Best overlap: 10:00 AM to 6:00 PM in Santiago is 8:00 AM to 4:00 PM in Lima.
Target 10:00 AM to 6:00 PM in Santiago, which lands at 8:00 AM to 4:00 PM for the Lima side. Lima is 2 hours behind Santiago, but with 8 hours of common ground you can hold morning or afternoon meetings without anyone working odd hours. Daylight saving complicates things slightly: Santiago observes it, Lima doesn't, so the difference flexes by an hour part of the year.