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Answers

According to the android-developers newsgroup:

The log buffers on the device are 64KB. The timestamp, process ID, and log level are stored in a compact format, so you may actually get more than 64KB of formatted data out of logcat -d -v <mode>.

No as per here it seems that the log buffers on the device are 64KB. The timestamp, process ID, and log level are stored in a compact format, so you may actually get more than 64KB of formatted data out of logcat -d -v <mode>

See also What is the size limit for Logcat?

Anyway for saving logs elsewhere you have: http://developer.android.com/tools/debugging/debugging-log.html that maybe could help you.

Buffer size is determined by the kernel, found in */drivers/staging/android/logger.c

Which buffers are used and the size has changed with Android Versions. Android 3.0 and newer also have a system buffer, and all four are 256kb. You have to recompile the kernel to change it.

You can increase the value of idea.cycle.buffer.size=1024 in property file android-studio/bin/idea.properties. This worked for me.

The “Logger buffer size option” of the Developer options settings of the phone allows to set it to a few values between 64k and 16M.

adb logcat -g then immediately shows the update limit.

Tested on 5.1.1, and this answer claims that it is a recent addition.

Set the size of the log ring buffer. Can add K or M at the end to indicate kilobytes or megabytes

adb logcat -G <size> 

Example: adb logcat -G 512K