Cold Crash Temp Schedule

I’m going to cold crash for the first time (a Kolsch with WLP029). It is in the secondary at 65 degrees. When cold crashing, should I go directly from 68 degrees directly to 40 degrees or should I slowly lower them temperature? I think the answer is to go directly to 40 degrees (hence then name crash), but I would rather be safe than sorry.

Thanks in advance for the help.

As long as the beer is done fermenting go ahead and drop it directly down. The closer to 32°-33° the better. If this is a kolsch it really should be lagered away.