At least 4 months
Hair growth is a slow process and using a ROGAINE ® product is not an overnight miracle. So remember, it will take some time to produce results. During the first 2-6 weeks after starting treatment, you may notice you are losing hair.  When using Women’s ROGAINE® Foam, results may be seen as early as 3 months with once daily use. For some women, it may take at least 6 months for results to be seen. You may need to use Women’s ROGAINE® Solution 2 times a day for at least 4 months before you see results. If you do not see any results after 6 months of once-daily use of the foam or 4 months of twice daily use of the solution, stop using Women’s ROGAINE® products and seek the advice of your doctor. When using Women’s ROGAINE® Foam, results may be seen as early as three months when used as directed. For some women, it may take six months of once-daily use for the foam or 4 months of twice daily use of the solution It takes time to regrow hair. Results with once-daily use of Women’s ROGAINE® Foam may be seen as early as 3 months, and for some women, it may take at least 6 months for results to be seen. You may need to use Women’s ROGAINE® Solution 2 times a day for at least 4 months before you see results. If you do not see any results after 6 months of once-daily use of the foam or 4 months of twice daily use of the solution, stop using Women’s ROGAINE® products and seek the advice of your doctor. When using Women’s ROGAINE® Foam, results may be seen as early as three months when used as directed. For some women, it may take six months of once-daily use for the foam or 4 months of twice daily use of the solution “I have been using Rogaine for about 1 year, it is working me for. My hair was very thin in the front area, and after using Rogaine I can see small hairs of regrowth. So it is working perfectly for me. I have been using this for one year, you will see results after a period of time so you have to be patient. I am happy with Rogaine.”. The manufacturers of Rogaine claim that results can be seen in as little as 8 weeks using the extra strength (5%) solution and an average of 16 weeks for the 2% strength solution. Results will vary from person to person, although generally speaking the earlier (younger) you start the higher your chances of success. Ultimately, Rogaine is a treatment for hair loss. Not a cure. You need to take it for as long as you want to continue to maintain your results. If you stop, you will likely return to your previous pattern of hair loss within several months of discontinuing treatment. Answer. It may take at least 4 months for results to be seen. Your results and success may depend on proper application and dosage: remember to apply ROGAINE® product twice a day, every day, directly to the scalp. If you do not see any results after 4 months, speak with your doctor. Remember, not everyone responds to ROGAINE® products and individual results will vary. If hair loss continues after 2 weeks on ROGAINE® product, stop using and talk to your doctor. I just started using ROGAINE® products and I've noticed that my hair loss has increased. Setting expectations. It's important to remember that you didn't lose your hair overnight-it was a process that happened over time. The same is true for regrowing your hair. While ROGAINE® products start to work immediately, it may take at least 4 months to begin to see visible hair regrowth. After that point, it's important to continue using ROGAINE® products every day in order to maximize and maintain your results. Here's a quick look at what you can expect during your first 4 months of using ROGAINE® products. If you do not see results after 4 months of twice daily usage applied directly to your scalp, talk to your doctor. Men's ROGAINE® Unscented Foam will give you the results you expect and the tools you need to succeed.  Hi gypsy, In my case, minidoxil started working after 1 month. I use 5% twice a day. I know that it is different for everyone in how long it takes to see results. My hair definitely thinned out after I started using minidoxil because of the stupid dread shed it caused. It was terrible-I lost like 400 hairs a day for a little over 2 weeks. But now, I have a ton of regrowth and shed very little.  1 If you do not see results after four months, consult with your doctor. 2  Minoxidil may not be effective for you. 3  Minoxidil can treat hair loss due to heredity, but not temporary hair loss due to pregnancy or medical treatments. 4  Minoxidil also only treats hair loss on the top of the scalp, not a receding hairline.  Results of Rogaine. It takes approximately four months to see results with Rogaine. The hair will grow in fine, soft and colorless at first and then grow to be like your other hair. According to the Rogaine website, 85 percent of men regrow hair in 16 weeks. 
http://www.rogaine.ca/how-does-it-work/what-happens-when-i-start-using-rogaine-products http://www.womensrogaine.com/faq http://www.womensrogaine.com/faq http://www.hairlossproductreviewer.com/164/rogaine-for-women-reviews/ http://www.hairtodaytheretomorrow.com/rogaine-review-does-rogaine-work/ http://www.rogaine.com/category/products/faqs.do http://www.rogaine.com/category/products/what+to+expect.do http://www.heralopecia.com/interact/showthread.php/21750-How-long-does-minoxidil-take-to-work http://www.wikihow.com/Use-Minoxidil-(Rogaine) http://www.ehow.com/how-does_4569910_how-long-does-rogaine-work.html
how long after using rogaine will i see results