Synonyms of 'long-drawn-out'
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If you describe something as interminable, you are emphasizing that it continues for a very long time and indicating that you wish it was shorter or would stop.
an interminable meeting
You use lengthy to describe an event or process which lasts for a long time.
the lengthy process of filling out forms
Something, usually something unpleasant, that is protracted lasts a long time, especially longer than usual or longer than you hoped.
The struggle was bitter and protracted.
Thesaurus for long-drawn-out from the Collins English Thesaurus
A long drawn out process or conflict lasts an unnecessarily long time or an unpleasantly long time.