It depends on the season, but generally you have 3-4 weeks before conditions aren't right for sap to run anymore. Plus after 3-4 weeks the hole you drilled into the tree will start to scab up and close over.u003cbr/u003eu003cbr/u003eu003cbr/u003eThe rate at which the sap drips will depend on the weather conditions that day. Sunny and warm always = faster running sap.