At a rate of 345,000 first doses per day – the current average – it will take until February 17 to vaccinate all of the top four priority groups, and then the remaining 17million over-50s and at-risk people could be reached in 49 days, or seven weeks, by April 7. At an average rate of 600,000 per day from today onwards – something the NHS has shown itself to be capable of, but which would require a lot of things to go right such as constant supplies, perfect organisation and even faster rates as people start to need second doses from mid-March – the first four groups could be done by Februayr 11 and all over-50s by March 12