Yes, that will be lots. I have one and I've used it for hours with my full-size 15" Acer laptop.
Be aware that it runs pretty hot. Make certain that you set it somewhere that the top and bottom are not blocked and can get full airflow. It needs good convection airflow, so be religious about that or you'll be sorry. I made the mistake of setting mine on the seat on top of a t-shirt so there was no airflow from the bottom. After half an hour it was almost too hot to touch.
...ken...