Manual:$wgForcedRawSMaxage

Details
Default maximum age (in seconds) for raw CSS/JS accesses.

Time Cheat Sheet

 * 300 = 5 min
 * 2700 = 45 min
 * 3600 = 1 hr
 * 54000 = 15 hrs
 * 86400 = 1 day
 * 518400 = 6 days
 * 604800 = 1 week
 * 1814400 = 3 weeks
 * 2419200 = 1 month
 * 14515200 = 6 months
 * 26611200 = 11 months
 * 29030400 = 1 year