How early is too early to ask for a status challenge?

HI all,

I recently was given silver status through a company program and a VERY helpful MR customer service agent. I recently had a post about the fastest way to gold/platinum status and people seemed to say that the challenge is a good idea. Would you recommend waiting until I reach the required 10 nights (I'm at 4 now and will most likely hit 10 in the next 2-3 weeks) prior to asking for the challenge? Or should I wait even longer? I don't want to waste my time or the customer service agents time if I need to wait to hit a certain threshold of nights. Thanks!