How long do you have to respond to a motion to enforce/contempt of court?

If it is a supplementary petition and he was formally served he has 20 days to respond. If the case is still open and it is just a motion, you can set it for hearing.

There is no requirement to respond to a motion for contempt and enforcement. You can set the motion for hearing.

The motion does not require a response but you can file one if you want to, or wait for the court date.

He does not have to respond to the motion. What makes you think he has to respond to it?

Responses are not required for Motions, however if you wish to file a response, you should do so as soon as possible. There is no pre-determined time frame to file a response under these circumstances. As a rule of thumb, I try to file my responses at least within 10 days from the filing of the Motion or at least 5 days prior to the hearing.

It really depends on the type of pleading served. A simple Motion does not require a response, but if served it is usually a good idea to file a reply so that the court can better understand both sides prior to any hearing on the issue. Since it appears that you are the one that served the pleading, if it was in motion form the issue is ripe for hearing and there is no need to delay in setting a hearing on the issue without delay. As others have stated, if you served a supplemental petition, 20 days is the response time.