adverb
for a long time, long (time)
A1
‘lange’ is an adverb meaning “for a long time” or “a long time.” It modifies verbs to indicate duration (e.g., Ich warte lange). It does not require a preposition, appears with temporal expressions (schon lange, seit langem), and commonly contrasts with kurz or plötzlich.
Examples
Die Passagiere warteten lange, weil der Zug wegen eines Sturms verspätet war.
The passengers waited a long time because the train was delayed due to a storm.
Ich habe lange auf dich gewartet.
I waited for you for a long time.
Es dauert schon lange.
It's been taking a long time.
Details
Mnemonics
Imagine a clock with the hands moving slowly for a long time.
Think of English 'long' + -e to make it an adverb.
Notes
'lange' as an adverb indicates duration. Don't confuse with adjective 'lang'.