Freestyle sprinting

Do most of the in-swimming-shape and experienced swimmers among you go all out for a whole 50 yards or is there some pacing? In other words are you going top speed the whole time? The reason I'm asking is that right now I can do 25 yards from a standstill in 13 seconds, but my best 50 yard time from a standstill is 33 seconds. (I'm a horrible diver at this point, but once I get my stroke in order I'll start working on that). Anyhow, is it reasonable for me to shoot for a 26 second 50 by just improving my endurance and flip turns, or is it like comparing 50's and 100's where a 50 time will always be less than half a hundred. Thanks for your thoughts. I don't do a lot of sprinting, but once in a while give it a few shots just to see where I am. Unfortunately I'm unable to do a master's class because I work in shifts and would miss half of them, so I'm pretty much on my own trying to get better. :badday: