equities - How to measure the practicality of a market portfolio for long-term investment?

Do you believe that the composition of the market portfolio that you have found is a desirable or practical one as an investment?

Explain why or why not, based on the positions of your stocks.

I have 30 stocks that I'm analysing and found the market portfolio (tangency portfolio) to have these statistics: Mean=0.03972, S.d=0.0568.

How would I know if the market portfolio is desirable or practical? What should I be looking for exactly?