R help - Jan 2018 - Document Term Matrix

Hi,

Does anyone know what is maximal term length in Document Term Matrix?


<<DocumentTermMatrix (documents: 255, terms: 858)>>
Non-/sparse entries: 8081/210709
Sparsity           : 96%
Maximal term length: 12
Weighting          : term frequency (tf)

Thanks for any help!
Elahe