1
general::
too long
long-winded
continuing for too long - used about speeches, answers, explanations etc:
• a very long-winded answer to a simple question • He gave a long-winded speech about the company's vision for the future.
interminable
very long and boring:
• They faced an interminable wait in the departure lounge of the airport. • The journey seemed interminable.
long-drawn-out
[ only before noun ] used about a process that continues for much too long:
• The news heightened expectations that the long-drawn-out investigation might be coming to a close.
Longman-Thesaurus