I recommend not stimulating yourself or looking at porn until you can get the time between ejaculations a little longer. Later, when you are able to easily go past one week, you can start reintroducing tantric masturbation and other forms of stimulation to boost your energy (you will be able to masturbate, have sex, or look at porn without feeling a need to ejaculate at the end). Trying to increase the length of time between ejaculations at the same time as you keep up the current level of stimulation is too hard.
Also, don't feel like you've failed if you can't make it to a week all at once. I remember for me I had to go from every other day to every third day for a few weeks, then after being at every third day for a few weeks I could go to every fourth day, and so on. Once you pass the one week mark it tends to get easier to go for longer periods of time. Still, I think gradual is the way to go. Right now I'm trying to move from once every two weeks to once every three weeks, but it is fairly tough having a girlfriend--I have to take it in small increments--fifteen days, sixteen days... etc.
This also illustrates how much harder it is to increase the time when you're getting a lot of stimulation. I remember once going for two months without any orgasm when I was single. During this time I was also not looking at porn or masturbating at all. Going for an equally long period but with more stimulation is a higher skill which must be worked up to over time, I think.
