How long should it take a platter to get up to speed?


I have an upgraded Acoustic Signiture Final Tool with 2 motors. It takes more time to speed up now. I've had it 3 years. It takes about 15-20 seconds. Is this a normal speed or is my belts slipping ? I washed them with Ivory dishwashing soap and put some pure talcum powder on them but it did not make a difference . I have tried different positions farther and closer. Maybe I should get new belts? Or is everything normal. Thanks. Mike
blueranger
Could dust have workied it's way down the shaft? I heat with wood. Just a thought?
Don't apply too much talc and use 90% alcohol. If it is still a slow starter try taking the belt off and give the platter a spin. It should take well over a minute to stop. If so, replace you belts.

Btw, on my non suspended table I don't use talc on my suspended I do. 
Bingo. That was it. I used cotton pads and 99 alcohol. Gets up to speed in about 8 seconds. Thanks for your help. I remember when it was new it was about 8 seconds. Mike