You’ve probably seen the news from the other day that Syria has accepted the terms for a UN team to visit the country to investigate allegations of chemical weapons use. According to the announcement, the inspectors’ departure “is now imminent,” though the UN said the same day that a “date for the mission has not yet been announced.”
The announcement also described some of the missions’ terms:
As agreed with the Government of Syria, the team will remain in the country to conduct its activities, including on-site visits, for a period of up to 14 days, extendable upon mutual consent.
Take a look at the UNSG’s Mechanism for Investigation of Alleged Use of Chemical and Biological Weapons, the appendices to which were updated in 2007.