Is already or has already?

Online Answer
Both are correct. However, more correctly, the present perfect continuous tense ends in a participle: "He has been practicing already for three hours." Alternatively, we can say, "He has already been practicing for three hours." The last usage is the most natural in English..
Related Questions 📌
If you are sick, you will likely have vomiting and diarrhea for several hours and feel horrible. You will need to sip on fluids as you are able. You can see a doctor for medications to help with the discomfort. I ate chicken that was left out overnight but I reheated it, I don't feel ill as I've only just consumed it..
It can be safe to use small amounts of aluminum foil in a microwave oven. Microwaves cannot pass through metal but are absorbed by food. No food completely covered by aluminum foil or in a covered metal pan should be put in a microwave oven because food wouldn't be available to absorb the microwaves..
Between 1979 and 1989, the worldwide demand for ivory caused elephant populations to decline to dangerously low levels. During this time period, poachings fueled by ivory sales cut Africa's elephant population in half.Nov 16, 1997.
Food can remain frozen indefinitely and technically be safe to eat, as bacteria will not grow. However, over time all frozen food will deteriorate in quality and become unappetising to eat when defrosted.
Sales growth failed to match early rates and last summer the renamed A2 Milk Company announced it was quitting the UK to focus on other markets. It blamed "category conditions which meant that developing a scalable premium-priced, fresh milk, proposition was increasingly challenging".