There is no limit the only thing is that it should be even number and you conclude it with witr so that total would be odd number

What is the Maximum Number of Raka’at (Units) of Prayers, a Muslim can perform in the Night Prayers (Qiyamum laili)?

Prayer | February 26, 2014 7:34 pm
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Is it Sunnah to recite a big surah in the first Rak’ah and in the second rakah you recite half of the amount? Is this makrooh to recite a surah which is small in the first rakah and a bigger one in the second rakah?