Can I expect my visa application to be approved by December 30th if the embassy says it takes up to 15 business days to process?

The user is concerned about the timing of their visa application as they booked a flight from London to Thailand on December 30th. The embassy states that processing can take up to 15 business days excluding weekends and holidays, leading to uncertainty about whether the visa will be approved in time. The comments highlight that there are potential issues and holidays affecting processing times and suggest that typically, one should avoid booking travel before obtaining a visa.