All righty, I'll take the more conservative approach for now and set the max time for /bomb to 90 seconds.
I'll also fix the bug where /bomb can kill you if you have both the [GOD] and [EX] mods on.
Can revisit this after the patch if necessary after the adjustment period.
I chose not to do this for optimization reasons. It doesn't look as good as you would think anyways. Nothing like the level 80+ ice element.