My total from <a href="http:&#x2F;&#x2F;www.watermark-image.com" rel="nofollow">http:&#x2F;&#x2F;www.watermark-image.com</a> last year has been around 35.000€ and it takes 5-10 minutes of support a day and 30-60 minutes once or twice a month doing bug features or new features.<p>My new project <a href="http:&#x2F;&#x2F;timeblock.com" rel="nofollow">http:&#x2F;&#x2F;timeblock.com</a> that are funded by that income and that I do not write any code for has generated app. 2000€ in recurring revenue last year although it is not passive yet it is MRR :)