I, personally, wouldn't put a time frame on when your team member(s) will not need anymore help from you. As a sponsor and Team Leader, we should always be there to help our team members out if and when they have questions. Some may need constant help while others may not want any help. Just ensure that when you are asked for guidance that you give your best guidance to help your team member in building their business.
I tell my team "If we work together, we succeed together".
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