In general, this is acceptable and is not objectively considered excessive, but only if you are monitoring your own Energetic State.
The 40 days given in the note for the Meditations, including the Basic Program for Opening the Chakras, is what Lady Maxine and the Priests have worked with, it is their Experience, some people will need more time. But even from personal Experience, 40 days is often enough, during this period of time you can create an «Energy Base» (depending on the type of Meditation and what Segment of the Soul you are Working with), you can build a Stronger Connection with the Ethereal Levels. This is kind of like a Starter Phase. At the end of it, if you don't notice any signs of Energy Exhaustion and you feel comfortable, then why not continue practicing. 40 days is your test period, at first you should focus on it, but don't get attached to numbers, that's not the point.
Everyone reacts differently to intensive Soul and Energy Working. Sensitivity, Training Level, Energy Potential, Plasticity of the Soul — all these are indicative and important factors to consider. And these indicators are different for everyone. So it is impossible to give an unambiguous and precise answer for everyone. Because on the Spiritual Path in terms of Practices everyone has his own pace of Development. It is very individual. If you have not experienced overload or loss of strength, but, on the contrary, you feel better and more wakeful, it will not only be not harmful to the Soul, but will «Accelerate» the very process of Unification of the «King and Queen».
Generally, too intensive Working will cause exhaustion and even deterioration of health, which can create a certain Disbalance in you, so, of course, it is worth reducing the Frequency and Depth of Meditation. Even if you are Practicing it in a 40-day period.
Please keep in mind, this Meditation is very Powerful and already requires a certain Purity of the Soul, as this Meditation follows right before the Kundalini Practice, i. e. at this stage you will already be Working with the Sushumna. Prepare yourself for the Practices gradually and carefully. If you feel terrible when you start Practicing, you should not go to this Meditation yet, do what comes before it, all the Practices are already very systematically and correctly organized among the columns on the website. But if you are feeling fine, then go ahead with it. It is not trivial to recommend to listen to your feelings, it is extremely important. You don't have to go against yourself like against the direction of the wind. This is not bravery or courage, but Idiocy, Ignorance and Ego Influence. You will be knocked down, you will not stand if you are not prepared. This Meditation is beautiful, but make sure you are prepared. Well, this advice applies to everything in Spiritual Advancement. It should be systematic.
The above mentioned is of special importance, because most of the negative effects occur when Practices are not performed correctly or when you ignore the Signals of your own Body, Intuition and Soul. Therefore, it is necessary to provide yourself with a decent rest and not to «pull» the Inner Energy, not to overload the Soul Reserves and Energy Resonators, as well as not to Accumulate more Energy in your Soul than your Soul is able to «process» in a favorable way. If you control your State, there will be no negative consequences.
In conclusion, I would also add that you don't need to be focused on the strict numerical values offered in ToZ. Individualize the process, adapt the approach to your conditions and Resources, pause if you find it difficult in the first stages. Not all Meditations produce a «euphoric» effect immediately, so control this.