A week is not excessive at all. Many people find that the first stage of a cycle can take 2-3 weeks; 4-6 weeks total for a cycle (without seed bacteria) is typical.
HTH,
Jim
HTH,
Jim
yeah, my 20 gallon tank took over 4 weeks to fishless cycle... i got impatient and got some bottled bacteria and added it in, and after i added it the ammonia went away and any ammonia i put in thereafter disappeared after a day. i am not really sure why a lot of people don't believe in the bottled bacteria, because it certainly worked to speed up my tank cycle.