This was a question posed in a thread that is now closed. How often can you tap a resin hole using a timer (RP2 stuff) without breaking the hole.
The meta data of the block is as follows:
1 = Not a resin block, just a normal rubberwood
2-5 = resin in hole (The different numbers are for the different faces, East, West, North, South)
8-11 = no resin in hole (The different numbers are for the different faces, East, West, North, South)
If there is resin in the hole, you can use the tree tap on it and gain between 1 and 3 resin. The number 6 is now added to the meta data of the block. (turning it into one of the empty faces for E,W,N,S respectively)
The block is scheduled to update in 100 ticks (5 secs).
If there is no resin in the hole, the block is updated after 100 ticks (5 seconds).
Here, there is a 1 in 200 (0.5%) chance that the blocks meta data will be set to metadata % 6. Effectively adding resin in the hole again. Thus, statistically it should take ~1,000 seconds (16 minutes and 40 seconds) for a resin hole to refill.
If the resin hole isn't filled, the block is scheduled for another update. Until the hole gets filled. (All based on chance)
IF you use a tree tap on an empty hole there is a 1 in 5 (20%) chance that the hole will be destroyed. Leaving you with just a rubbertree block.
However, there is an additional 1 in 5 (20%) chance that you extract 1 resin out of an empty hole. Destroyed after the fact or not, doesn't matter.
So before you cut down a rubber tree that has empty holes in it. It is a good idea to tap all empty holes until the disappear (unless you are in love with that particular tree tap)
Doing so will give you one extra resin per 5 holes you tap on average.
Now you know all you need to know about resin extraction.
EDIT: Updated a miss i made, meta 8-11 is no resin in hole. Had it wrong at 7-11.