how many re-activations do i get?

i use 30 dau trials of windows 7  so when its close to end, i reinstall.

so i recently got a few stardock products, tweak7,iconpackager,deskcapes. i use impulse to install and i think it automatically activates it. i wanted to know if i'm limited on how many times i can re-activate...its all on the same computer.

also, what about my laptop? can i install these on my lappy too? i dont have to reinstall it like i do my desktop