Good time to buy stocks and hold ?

If you had to ask this question then it's No for you.

What if the stocks you buy have flatlined growth (no negative and no positive) for next 10years, how would you know that ?

What if a new scam with your stocks is uncovered ?

What if a competition with superior technology dethrones your stock's market share?

What if the current growth of the stocks you picked is a result of artifically operated by brokers?

Time, cycles are different by Sectors, companies, technologies used by these companies.

No one can generalise it.