what does 25 or 6 to 4 mean in the chicago song

“25 or 6 to 4” is generally understood to mean 25 or 26 minutes before 4 a.m. , so around 3:34–3:35 in the morning. The song is usually interpreted as Robert Lamm writing through a sleepless night, with the title pointing to the time rather than a secret code.

What it means

• The phrase sounds odd because it’s a shorthand way of saying “twenty-five or twenty-six minutes to four.”
• Chicago members have described the song as being about trying to write a song late at night, not about a literal event.
• Some listeners have speculated about drug references, but that interpretation was never the official meaning and has been treated as speculation.

Why the title is confusing

The title is written the way people sometimes casually say the time, which makes it feel cryptic. That ambiguity helped the song become memorable and sparked decades of fan theories.

In plain English

It basically means: “It’s almost 4 in the morning, and I’m still up trying to create something.”

TL;DR: it’s a late-night time reference, most likely about insomnia and songwriting, not a hidden message.