\unexpanded\def\sample{\dorecurse{30}{xx }}

\starttext

\defineenumeration
  [exercise]
  [title=yes,
   text=TEST]

\exercise {\sample} \input tufte

\definedescription
  [whatever]
  [title=yes,
   text=TEST: ]

\whatever {\sample} \input tufte

\definedescription
  [whatever]
  [location=top,
   text=TEST: ]

\whatever {\sample} \input tufte

\stoptext
