Maybe is the answer. From what you saying, it looks like you were deiced and anti-iced in a single step procedure with less than 100% fluid. The other factors influencing your hold-over time (which commenced in your case when the treatment started) are the temperature, the type of precipitation and the de-icing fluid type. Using this information, you look your company's Ops manuals books to get the hold-over time range. Then you read the small print and find out that no-one is guaranteeing anthing!
PM