I'm sorry @Ondřej-Šutera , it was my fault.
I entered the speed and everything except the white bar with the time estimation was as usual. I haven't noticed that the speed checkbox has been inattentively put to switched off state. I enabled the speed and now it's all right.
By the way, the route planner is a great and helpful tool! It will be even more helpful if you consider an upgrade of the speed textbox with a possibility to specify multiple (e.g. 2-3 different) speeds for different time intervals. The wind condition changes and the speed of the sail boat also changes significantly. It is not often used, but sometimes it will help to take a better decision in difficult conditions.