Are time-spans generic or specific to a given event?

[jpadfield]

cidoc-crm.examples/models/production/production-triples.csv

Lines 50 to 57 in 91a5c27

	_Blank Node crm:P2.has type crm:E52.Time-span
	_Blank Node crm:P2.has type aat:300379244
	_Blank Node crm:P82a.begin of the begin 1505-01-01 #xsd:dateTime
	_Blank Node crm:P82a.end of the end 1505-12-31 #xsd:dateTime
	_Blank Node rdfs:label 1505@en
	_Blank Node owl:sameAs wd:Q6153
	ngo:002-0432-0000 crm:P4.has time span _Blank Node
	aat:300379244 rdfs:label years@en

A comment has been made that indicated that time-spans are specific to a given event so they can not be used multiple times and or be marks as the sameAs other time-spans? (And this does disagree with the current scope note)

I do not quite understand this? I can understand that the period of a time-span for two events are unlikely to be the same, down to the micro-second. But if the period is only defined in terms of years, or even hours, then why can it not also be the period that covers other activities?

It would be good to clarify what the issues is here.

From comments originally made by @natuk