Hi, what is the ferry cost from a HK hotel to Macau? and How long is the ride?

You should know that ferries from HK to Macao are available at two ferry terminals: China Ferry Terminal and HK-Macao Ferry Terminal.
For the former one, it costs 159-196HKD for an economy class cabin (fare varies from weekdays and holidays) and takes around an hour.
For the latter, it costs 159-195HKD for an economy class cabin and the duration is around 55min.
Figure out which one is closer to your hotel first.