Does it Take More Time to Edit HD Than SD?

It shouldn’t. Yes, it always does.

Offline and online editing HD should closely resemble regular video editing or film editing in case of 23.98p production. HD may take longer. A typical HD production for TV or cable will use multiple tape formats and multiple frame rates. Also, since you’re dealing with a larger image it will take longer to render effects. This is the area where a very fast high end editing/compositing box outperforms less expensive NLEs.

In some cases the amount of time needed for HD editing can be comparable to the SD counterpart.