What is the total runtime of One Piece up to this point? After reading this Question and the ingenious answer from Dimitri mx (kudos) and a related comment, I came to wonder how One Piece would compare.

The anime was launched in October 1999 and is still ongoing.
Before I start with the actual comparison, I would first like to note that in the current point in time, Naruto and One piece do not differ to much in run time. But taking into account that Naruto is running towards the end, and Oda Eiichiro said that he is about the half way mark, we can safely assume that in a near future this will change. With that said.

Just like in my mentioned answer, I have been using Myanimelist as a source of times. And came to the conclusion that it would take you 
18945 Minutes of non stop watching one piece (excluding cross-overs)
which equals to 315.8 Hours or 13.2 Days 

making the difference in time about 1620 Minutes
which equals to 27 Hours or slightly more then 1 day

This difference in run time is caused by One piece having:


220 more episodes
4 (soon to be 5) more movies
7 more Ova's 
1 More special


Where as Naruto only beats one piece in


Having a second season
Having a spin- off series.


Actual Serie 

One Piece 710 episodes (currently), roughly 24 minute's/Episode* 
~17040 Minutes or 11.8 days

Movies


One Piece  50 Minutes
Nejimaki Jima no Daibouken 55 Minutes
Chinjuujima no Chopper Oukoku  55 Minutes
Dead End no Bouken  95 Minutes
Norowareta Seiken  95 Minutes
Omatsuri Danshaku to Himitsu no Shima 6  95 Minutes
Karakurijou no Mecha Kyohei  94 Minutes
Jango no Dance Carnival  6 Minutes
Yume no Soccer Ou!  5 Minutes
Mezase! Kaizoku Yakyuu Ou  5 Minutes
Strong World  115 Minutes
Film: Z  107 Minutes
One Piece (2016) Unknown
TOTAL: 777 Minutes or 13.0 Hours


Movies (Summary's)

All tough most of the ones listed under this tab are officially known as specials, I still decided to list them in their own sub-category of movies as I found it to be more fitting.


Episode of Alabaster - Sabaku no Ojou to Kaizoku Tachi  90 Minutes
Episode of Chopper Plus - Fuyu ni Saku, Kiseki no Sakura 113 Minutes
Episode of Nami - Koukaishi no Namida to Nakama no Kizuna  106 Minutes
Episode of Merry - Mou Hitori no Nakama no Monogatari  106 Minutes
Episode of Sabo - 3 Kyoudai no Kizuna Kiseki no Saikai to Uketsugareru Ishi  105 Minutes
TOTAL: 520 Minutes or 8.7 Hours


Ova


Taose! Kaizoku Ganzack  28 Minutes
Umi no Heso no Daibouken-hen  49 Minutes
Oounabara ni Hirake! Dekkai Dekkai Chichi no Yume!  46 Minutes
Romance Dawn Story  33 Minutes
3D: Mugiwara Chase  30 Minutes
3D: Gekisou! Trap Coaster  12 Minutes
Romance Dawn  30 Minutes
Episode of Alabaster - Prologue  15 Minutes
Recap (10 year recap, from start up to Impeldown)  29 Minutes
TOTAL: 272 Minutes or 4.5 Hours


Specials


Mamore! Saigo no Dai Butai  45 Minutes
Nenmatsu Tokubetsu Kikaku! Mugiwara no Luffy Oyabun Torimonochou 42 Minutes
Straw Hat Theater (5 eps. 3 Min/ep)  15 Minutes 
Episode of Luffy - Hand Island no Bouken  102 Minutes
Glorious Island (2 eps. 5 Min/ep)  10 Minutes
3D2Y: Ace no shi wo Koete! Luffy Nakama Tono Chikai  107 Minutes
Cry Heart (3 eps. 5 Min/ep) 15 Minutes
TOTAL: 336 Minutes or 5.6 Hours


Small side note: All tough I taught it was said for Naruto fans to wait a whole week, One piece fans had a even harder time having to wait 832 weeks or 16 years! With the sole exception being Hinati Fujinamai Ending revealed to severely sick boy


  JapNation AniManga reports that Eiichiro Oda was glad to tell the kid how One Piece ends and that he was holding back his tears upon seeing the condition of Hinati Fujinami.
  While Oda was fine with Hinati Fujinami learning about the One Piece ending, Oda requested to talk to the child alone so that details about the One Piece manga ending wouldn't be leaked while he jokingly pleaded to Hinati to not reveal it to the press.
  JanNation AniManga noted that at the end of their talk, Hinati Fujinami was reportedly seen smiling but crying at the same time as he told the people that One Piece is "beautiful".