This is what I get
exec titheinfo
{
  "Command": "titheinfo",
  "POG Difficulty": 15151.39403913321,
  "24 Hour Tithes": 11350.8,
  "pog_diff_chain_tip": 15151.39403913321,
  "min_coin_age": 13.87,
  "min_coin_amt": 5780.66,
  "max_tithe_amount": 230.87,
  "Tithable_Coin_Quantity": 0,
  "Tithable_Largest_Coin": 0,
  "Tithable_Coin_Avg_Age": 0,
  "Tithable_Total_Coin_Balance": 0,
  "Tithability_Amount": 0,
  "Tithability_Summary": "NO",
  "Tithe_Cap": 49096,
  "Daily_Miner_Emissions": 96188,
  "Pool_Emissions": 76950.40000000001,
  "Lowest_ROI%": 78.5,
  "Highest_ROI%": 339
}
I have 370000 coins so I guess I don't need more, but I don't know if I can start tithing now.
getmininginfo
{
  "blocks": 99878,
  "blocks_tip": 99878,
  "currentblocksize": 1000,
  "currentblocktx": 0,
  "difficulty_podc": 6.964404506368992,
  "difficulty_pow": 0.1056952030005922,
  "difficulty": 6.964404506368992,
...
  "pool_url": "",
  "poolmining_use_ssl": false,
  "pool_high_tithe": 5048.1,
  "pool_my_total_tithes": 0,
  "pool_total_tithes": 10929.6,
  "pog_difficulty": 14589.16343254311,
  "pog_min_coin_age": 13.36,
  "pog_min_coin_amount": 5566.19,
  "pog_max_tithe_amount": 233.44
}
If I tithe 
19:42:13

exec tithe 1000
{
  "Command": "tithe",
  "Error": "Sorry, your tithe exceeds the maximum allowed tithe for this difficulty level.  (See getmininginfo)."
}
or 
exec tithe 200
{
  "Command": "tithe",
  "TXID": "0000000000000000000000000000000000000000000000000000000000000000"
}
I guess that if min coin age is 13.87 days and mine were generated today I will have to wait 13.87 days?
The chat is not working for me (apparently). You may want to contact me perhaps it works the other way.