Have you ever thought that your items disappear too quickly? Or maybe you think its actually too short. Perhaps the normal timer is just fine, but you wish you had just a little more time to collect your items after you die. Or maybe you want your items to despawn faster to give death that little extra stress factor.
Whichever type of player you are, Stay A While is the mod for you

Stay A While adds three gamerules

• maxPlayerThrownItemAge the amount of ticks an item that was thrown by a player (using Q key by default) takes to despawn (default: 6000)
• maxPlayerDeathItemAge the amount of ticks an item that was dropped by a player upon death takes to despawn (default: 6000)
• maxItemAge the amount of ticks all other dropped items take to despawn (default: 6000)

In case you are unfamiliar with them, 20 ticks == 1 second
Any value less than 0 (i.e. negative values) are interpreted to mean "never despawn"

Yes! Just install on the server and you're good to go. No players need to install!

Any items dropped on the ground should retain the maximum age they had from the time they were dropped