Слово встречается в следующем контексте:

Minimizes procedure time, thereby increasing blockable OR time (из описания гидрохирургической системы Versajet - http://wound.smith-nephew.com/no/Standard.asp?NodeId=4360).

Заранее спасибо
С уважением, Юрий

We encourage the use of "block time." It helps us to optimize our O.R. time and clearly is the most efficient use of a surgeon's time. We expect to amply accommodate those surgeons who choose not to use the block booking method. We will also try to accommodate add-ons and last minute needs.