Cramer's lightning round: Time to buy Zynex stock

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

Virgin Galactic: "The class action stuff doesn't bother me as much. What it really is is that it's basically a very expensive stock and I think it had a good run. Let's find others."

Digital Realty: "I would stick with it."

Generac Holdings: "This is a stock that I like very much. Please, do not sell that stock."

Sorrento Therapeutics: "I think it's fine. I mean, look, it's not really a meme stock, but it's one that is — it's got too much hot money in it."

Haemonetics: "I'm a buyer of Haemonetics."

Zynex: "Your analysis is spot on, sir ... It's time to buy, not sell your stock."

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