you can do both reading and math together and it would be good. you would you 5 cards for a set and spend almost a minuet for each set. you can do for three to four sessions. when showing the cards you must be very fast so that the your baby may not feel bored. first day you can show the same cards for the four sessions and second day first three session also and for the forth session you can keep the A and B card out and introduce F and G card like this you can continue. I am also a working mother, my session are as follows, early morning the first session can be done. after the breakfast about 11:00 after her nap at bout 13:30 and night about 19:30. hope this would be enough.