Session locks are those that span multiple transactional units ofwork; they cover the entire durationof some business process.
会话锁是指那些跨越多个工作事务单元的锁，它们涵盖某些业务流程的整个持续期间。
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Duration: the durationof the work item, this is shown as "Estimate" in the UI, if the contributor doesn't set value to this data field, we believe its value is 0.
Our final hurdle was the physical work environment; namely, obtaining an available, single room large enough to hold the team for the durationof the project.