Minecraft 1.4.5, Snapshot 12w50b, Minecraft 1.5, Minecraft 1.5.2, Minecraft 1.6.1, Minecraft 1.6.2, Minecraft 1.7.4, Minecraft 14w05b, Minecraft 14w06b, Minecraft 14w07a, Minecraft 14w08a, Minecraft 1.7.5, Minecraft 1.7.9, Minecraft 14w18b, Minecraft 1.7.10, Minecraft 1.8, Minecraft 1.8.1-pre3
This happens in both Survival and Creative.
1. Press F3 and look at your X or Z "c: ()" chunk/block coordinate.
2a. (Survival)Make sure hunger is high enough for sprinting.
2b. Sprint along one axis.
Notice after 10 chunks to the block that sprinting stops.
Tried with slow and speed potion with different results:
Slow: Seems to lower the amount of distance to around 9 chunks.
Speed: Seems to increase the amount of distance to around 13 chunks.
Possibly time related and not distance?