Long integer (32 bits on 32–bit platforms and 64 bits on 64–bit platforms)
3600 seconds (1 hour)
0 to 231 - 1 on 32–bit platforms
0 to 263 - 1 on 64–bit platforms
The size of the NFS authentication cache can be adjusted by varying the minimum age of entries that can get purged from the cache. The size of the cache should be controlled so that it is not allowed to grow too large, thus using system resources that are not allowed to be released due to this aging process.