30 year term life insurance is priced based on the age and health of the insured. In order to better answer this question, these two pieces of information would be necessary.
You can contact an agent with this information to receive a free quote so you'll know the cost of 30 year quote.
To find the cost of term life insurance for 30 years, you can go to a website that offers quotes online. If "instant" quotes are offered, you can change the amount and term length and compare the cost of different policies. The cost of 30 year term life insurance is higher than the cost for shorter terms, but it is locked in for 30 years at the health rating you are now. So that can save you lots of money in the long run.
You can contact an agent with this information to receive a free quote so you'll know the cost of 30 year quote.