  2-charge D1-D5 microstates are described by geometries which end in `caps'
near r=0; these caps reflect infalling quanta back in finite time. We estimate
the travel time for 3-charge geometries in 4-D, and find agreement with the
dual CFT. This agreement supports a picture of `caps' for 3-charge geometries.
We argue that higher derivative corrections to such geometries arise from
string winding modes. We then observe that the `capped' geometries have no
noncontractible circles, so these corrections remain bounded everywhere and
cannot create a horizon or singularity.
