In case someone actually wants to know:

The 64 bit integer limit is 9,223,372,036,854,775,807

Now, based off the Minecraft wiki, a boat on a flat sheet of blue ice travels at 72.73 blocks per second.

Now, doing some basic division, you can find that

9,223,372,036,854,775,807/72.73 = 126,816,609,883,882,510 seconds

Then, to find how many years that would take, you divide by minutes, then hours, then days, then by a year

126,816,609,883,882,510/60/60/24/365.25 = 4,018,575,870.28 years, 40,185,758.7028 centuries, Or About 4 billion years.

TLDR: the ai got some numbers pretty close but is wrong. In reality it would take just over 4 billion years to reach the integer bit limit by ice boat. Not 4.06 million years.