sentences:  Currently used embargo times (often 6–12 months in STEM and over 12 months in social sciences and humanities), however, do not seem to be based on empirical evidence on the effect of embargoes on journal subscriptions.In 2013 the UK House of Commons Select Committee on Business, Innovation and Skills already concluded that "there is no available evidence base to indicate that short or even zero embargoes cause cancellation of subscriptions".There are some data available on the median "usage half life" (the median time it takes for scholarly articles to reach half of their total downloads) and the difference therein across disciplines, but this in itself does not prove that embargo length will affect subscriptions.