Hi Vichara and welcome to the AYP forums
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It is probably not a wise idea to play "mantra catch up"... this could result in system overload. But that also depends on the meditation you are using. If you did this with the AYP practice of Deep Meditation you could almost guarantee some difficulties. If you feel the desire to be doing 2 malas per day, then just start with that tomorrow and diligently watch for any negative effects... then adjust as needed.
Just a couple of side notes.... it may be difficult for folks here to advise you on your practice without having previous personal experience with the style of practice you are doing. And, the benefits of any practice come with long term consistent use. 40 days will be good for that period of time, but the benefits will likely eventually fade away as you stop practicing.
Good luck!
Love!
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