rubber time
n.— «Hotel staff told me the power would come back on at 9 p.m. But kind of like Chilcotin time, Vietnam has what is known as rubber time. So it was actually closer to 10 p.m.» —“Blackouts, bicycles, and a chance B.C. meeting” by Karen Longwell in Vietnam Wiliams Lake Tribune (British Columbia, Canada) Mar. 15, 2007. (source: Double-Tongued Dictionary)