  In single field slow roll inflation models the height and slope of the
potential are to satisfy certain conditions, to match with observations. This
in turn translates into bounds on the number of e-foldings and the excursion of
the scalar field during inflation. In this work we consider broad classes of
inflationary models to study how much the field excursion starting from horizon
exit to the end of inflation, $\Delta \phi $, can vary for the set of
inflationary parameters given by Planck. We also derive an upper bound on the
number of e-foldings between the horizon exit of a cosmologically interesting
mode and the end of inflation. We comment on the possibility of having
super-Planckian and sub-Planckian field excursions within the framework of
single field slow roll inflation.
