immediately vs lengthily

immediately

adv
  • In an immediate manner; instantly or without delay. 

conj
  • directly (as soon as), instantly, the moment that. Indicates that the independent clause describes something that occurs immediately after the dependent clause's referent does. 

lengthily

adv
  • In a lengthy way, in a manner that is long and drawn out, especially in time. 

How often have the words immediately and lengthily occurred in a corpus of books? (source: Google Ngram Viewer )