Describe the solution you'd like
A time-based return of XP for breaking blocks. Starts at 0%, slowly increases to 100% over a duration.

Config would look something like:

        #If non-zero, number of minutes until a placed block will give full XP for breaking it
        block_xp_delay = 0

Why is this feature needed
Ideas for extra ways of handling block XP anti-cheese

Describe alternatives you've considered
Procrastination.

Optional:

• Have the curve be exponential or linear.
• Have a duration of it not giving any XP for a set duration before the curve starts.

Could you edit #533 to include both. It is going to be a certainty that users will want hard cutoffs and diminishing, so might as well bundle it as one feature.

What's the difference between this and #533?

This would be a slow ramp up from 0% to 100% of the XP you should get.

#533 Would be a hard cutoff for when you would start getting XP for the block.