for a long time vs for long time

Some examples from the web:

• Oct 27, 2011 ... Which preposition is correct and what is the difference in meaning if any? I went to the gym, something I haven't done for a long time. I went ...
• In formal contexts, if something bad or unpleasant continues for a long time and never improves, you can say it happens unremittingly.
• How to use "for a long time" in a sentence? ... These sentences come from external sources and may not be accurate. bab.la is not responsible for their content.
• "I felt for a long time like everything beautiful in me had been taken out": Women's suffering, remembering, and survival following the loss of child ...
• Mar 21, 2023 ... 'I cried for a long time': Black hair stylist's dream crushed by racist neighbor. Angel Pittman says her dream to create a mobile hair salon ...
• 2 days ago ... He gets better and better every year, and I really hope Alex is here for a long time.” The Steelers have made some moves this offseason to free ...

Some examples from the web:

• I rode in a rocking palanquin for long time
• For long time, I waiting for him to change.
• We've been after this guy for long time.
• It hasn't been used for long time.
• I haven't opened this bed for long time I don't know if it's comfortable.
• No power for long time, Commander.
• She was resentful for long time, but then...
• Haven't seen him for long time.
• I not see Johnno for long time.
• Stu is the first human friend that I've had for long time.
• I cooked it for long time, so it became tender.
• After completion of "Hiruko" he entered into a production... which he was planning for long time, and it finally came alive.
• You must being ready for long time Putting on the bullet-proof coat and wearing the helmet
• The Commission is aware that residues of the impact of missiles may be present in the affected areas for long time spans, and may be the cause of incorporation by inhalation of suspended dust or by ingestion of drinking water.