Your body takes about 4 to 6 weeks to completely replace the stem cells you donated. You should be able to donate again after this time.
According to 2018 research, people who donate a second time have a similar experience to the first time they donated. But the yield of stem cells wasn’t as high the second time around.
Still, it’s rare to find a second match. According to the Asian American Donor Program, the chances of an unrelated match are between 1 in 100 and 1 in 1 million.