The range of these sessions for sprinters will
usually be runs of between 6 and 30 seconds where there is nearly
complete recovery between each of the runs (particularly if they are
near the upper limit of this time).
However, for longer distance runners this can be increased to up
to about 3 minutes, provided there is good recovery between the runs.
A marathon runner, for example, would view 1000m repetitions at
their 5000m race pace as speed endurance.
Regardless of the type of
runner, a typical session may consist of, say, 5-7 repetitions with
about 2-3 minutes recovery for distance runners and about 5-8
minutes for sprinters.