The 30/60/90 day business plan outlines goals for a new sales representative to get established in their territory. Within 30 days, they aim to identify their top 60 target accounts and meet with existing accounts to understand needs. In 60 days, they will conduct daily sales activities like 10 new account meetings per week and cross-selling to leverage relationships. By 90 days, they plan to exceed monthly quotas through regular follow-ups, successful territory management, and partner selling.