lengthy
1. [ adjective ] relatively long in duration; tediously protracted
Synonyms: prolonged extended protracted drawn-out
Examples:

"a drawn-out argument" "an extended discussion" "a lengthy visit from her mother-in-law" "a prolonged and bitter struggle" "protracted negotiations"

Related terms: long
Similar spelling:   length
  lengthily
  lengthways
  lengthen
  lengthwise
  lengthened