Do I actually only have 3 days to save Miller?

So, I got to Chapter One, and Ocelot kept talking about he thinks Miller "probably has about 3 days left". This seems like an arbitrary number he chose.
When I finally got control of my character, I listened to all the audio tapes I'd unlocked and noticed that about 6 hours of game time had passed in the 20 or so minutes I'd been listening to them.
This made me wonder... am I actually under a time constraint to save Miller, or can I run around and explore as much as I want before proceeding with my main objective?
Best Answer
If you wait long enough, the mission will fail when you rescue Miller, ending in a Time Paradox.
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Does Miller betray venom snake?
The Phantom trains Solid Snake along with Miller to infiltrate Outer Heaven. During Snake's mission, the Phantom unveils his loyalty to BB and betrays Snake and with him Miller. Along with Solid Snake he worked for chipher without actually realising it. So Miller's fooled time and time again by both BB and Cipher.What happens to Miller after MGSV?
After eventually abandoning Big Boss and Diamond Dogs, under the name "McDonell Benedict Miller," he later served as a survival instructor for the SAS, the Green Berets, a U.S. Marine boot camp, and eventually FOXHOUND.How do you say keeping waiting to Miller?
After saving Miller during Mission 01, he will tell you to say the magic words. Press either Y or Triangle and Big Boss will reply, \u201cKept you waiting, huh?\u201dDoes Miller know about Venom Snake?
The post credits dialogue between Ocelot and Miller indicate that Miller didn't know about Big Boss's departure and Venom Snake acting as a stand in for Big Boss.nick miller being relatable for four minutes straight
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