My DD does not have a good attention span either, she is 4 months. These are her awake times - morning - about 1 25min, middle of day - 1 45 min, afternoon - 1 30 min, before bed - approx 1 45min.
I have noticed so much change in DD in the last 2 weeks, it is amazing the things she can now play with and grab.
We have one toy that she sits in and has toys all around it that she loves, we are also about to buy her a jolly jumper. I think she gets bored easy so i am trying to find things to amuse her.
Usually in the middle of the day we go for a trip to the shops or park.