One thing the dev in question can do is to send out a daily email to management summarizing the progress they made that day and the work that is still left. Wi

One thing the dev in question can do is to send out a daily email to management summarizing the progress they made that day and the work that is still left. With a week of progress logged it might be easier to steer the conversation with management towards the preparation of a realistic estimate for the remaining work. If this is not something management appreciate or are interested in discussing it is likely the dev in question could find more pleasant employment elsewhere.