for a very long time, prokaryotes were the only living creatures on earth. how long a period?

i would appreciate a straight answer please!!!

Apologies for any confusion. The exact length of time during which prokaryotes, the earliest form of life on Earth, were the only living creatures is not known precisely. However, prokaryotes are believed to have appeared on Earth around 3.5 to 4 billion years ago. The time period during which they were the predominant form of life is often referred to as the "Prokaryotic Age." It lasted for about 2 billion years until the first eukaryotic cells, which are more complex cells with a nucleus, emerged. So, to answer your question, prokaryotes existed as the dominant life form for roughly 2 billion years.