[Ryan2]

I want to make a player invincible for X amount of seconds as a reward. Is something like this possible?

Something like spawn protection but of course they can be invincible anywhere in the map.

[breezetix]

god in console

[Marttt]

You may hook clients with "OnTakeDamage" and change damage to 0 / or return Plugin_Handled;

Just search some examples
https://forums.alliedmods.net/showthread.php?t=341920

To control for how long, I always create a client based variable (MAXPLAYERS+1) and control the time with GetGameTime()