Lord Brahma's Life span

There are 1000 Maha yugas in the 12 hour "day time" period of Brahma's day.

It is during his "12 night time" period which is 4 billion 320 million human years long in that same 24 hour day that Brahma sleeps and a partical annihilation takes place.

Also there are NO Maha-yugas in Brahma's 12 hour night-time period while he sleeps.

So yes there IS a partial annihilation of the material universe at the end of every day-time period of Brahma beginning at Sunset and lasts to Sunrise which also is 4 billion 320 million human years long.

This happens in every 24 hour day of Brahma or full day which is 8 billion 640 million human years long.

This goes on in every day of Brahma's life which is 311 trillion 40 billion human years long for which is 100 of his years in his dimension of space-time.

Furthermore there is two Kalpas in a 24 hour day of Brahma, one for the 12 hour day-time and one for the 12 hour night-time