Breaststroke 1000 meters for 40 minutes, with an average of only 25 meters per minute. If the technology is in place, some people may find this speed uncomfortable because it is too slow.
It is normal for a normal kick to slip about 1.5 meters, regardless of gender. So the slowest breaststroke should be kept within 30 minutes. If it takes more than 30 minutes, there must be something wrong with your own breaststroke skills (of course, as long as your body is normal). At this time, you should stop and practice more technical moves.
Although people's body shape and strength foundation will also affect the swimming speed of breaststroke, it is relatively easy for most people to swim for 30 minutes in one kilometer, while the fast speed can swim for 20 minutes.