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Stars are forming in the region all the time. Some of the stars are fully formed, others are still in the process of forming. Some of those stars are in the early to middle stages of formation and are protostars, others are more advanced in those stages and are pre-main sequence stars. Some haven't even started to form, yet, and are still globs of dust and gas (Bok Globules, etc).
Those big stars don't take long to form at all. Most only stay in the pre-main sequence stage of development for 50000-100000 years. Protostar stage can draw out a bit longer, but they take far less time to form than a solar mass star. Takes a solar mass star about 20-30 million years to form, most of that in the pre-main sequence stages.
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