@moodyfd I've followed through with how long my story will stay on the Fresh, it's less than a week, more like a couple of days. One of my stories is now on the last page and I only posted it yesterday, so I guess it depends on how many updates there are overall in this case, as they are not the same number at all times. I agree with the routine, but considering I have the chapters already created, I might post them more often. Thank you for the advice. ^^
@Teowi I am not sure about the new version of the app, I have the current one, and there's no Fresh category on the page. Only Noteworthy and New Premium and Tapas Exclusive/Originals. Indeed I am not sure how much exposure the Fresh page will help with getting more people to read unless they use the website version. Are the number of users from the mobile a lot more than the ones from the website or is it around the same?
My novel was written to have around 1200-1500 words per chapter so I cannot split them up or add them unless I want to do 2 POV per chapter, but where would the fun be in that?
It was basically written to allow for short reads while on the bus or train, at breaks, and so on.
I'm happy for the young adult userbase, my main target is young adults and adults,
@emmyengberts I do have quite a large backlog and most of it is already published on Wattpad, so if one looks for it, it will appear almost posted, so I don't feel the need to wait too long to post it here. I think I'm actually going to do as you said and post it twice a week. That way it can get some visibility and hopefully it won't be too fast or too slow for the readers.
Regarding the update time, I've looked over an Alexa for Tapas info, it said there that 43% of the people accessing it are from the USA, 5% UK and then Europe. From the forum exchange, the times when I felt the forum was the most used was at around 5-6 pm my hour so around 7-8 AM PDT and 4-5 PM CEST. So it seems you hit the perfect times for the updates. Thank you. 
I think I'm going to go with Monday and Tuesday or something similar for the updates, during the week, to avoid the rush when everyone else is updating on the weekends. 
By the time I will have everything posted, the story will hopefully be finished properly.
@375 & @laiscnogueira I think once every 3-4 days should be enough in my case, don't want to get overexcited and post everything at once. XD
Thank you all for sharing this information with me and helping me out. 