About: http://webisa.webdatacommons.org/383889000

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I have not counted it exactly, but I agree that 50-100 hours is a mark when the highs loose their slight hotness and grittiness.
http://www.w3.org/ns/prov#wasQuotedFrom	head-fi.org