Synonyms of long-drawn-out
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interminableIf 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
lengthyYou use lengthy to describe an event or process which lasts for a long time.
• the lengthy process of filling out forms
protractedSomething, 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