Can I have a blogspot URL that is long not updated or without any post?

1. According to Blogger policy, blogspot URL do not expire. That means theoretically, they are forever. However, if it has been identified (rightly or wrongly) as a spam blog, there is a possibility that the blog will be deleted and the URL becomes available again and then you can have your go for the URL.

2. According to Gmail policy, if there is no activity on your Gmail account for 9 months or more, your Gmail address can be deleted. If you use that Gmail address as the username for a Blogger account, and it has been deleted, it is likely that the same may happen to your Google account together with the blogs (this may also apply to the blogger whose URL you want). Amazon products for Blogger

But what if the Blogger account is started with a non-Gmail email address like, for example, Yahoo?

Yahoo, when it first started, says their email addresses are for life (what exactly "for life" is up to you/them to interprete). Now when you start a Yahoo email address, that message no longer appears, so I don't know what are their current policy is. However, if you don't sign into a Yahoo email address, it will be deactivated. I am guessing that if you use a Yahoo email address for your Blogger (Google), you have less chance of getting your Blogger (and Google) account getting deleted, together with the blogs.

I am testing what are the actual effects of all these mentioned at Will Blogger blogs ever be deleted?. The results wouldn't be known for some time.

So if you are eyeing a particular blogspot URL, if for any reason the blog is deleted, you can have a go at the URL.

Other possibility is to try to contact the blog creator and ask if he or she is willing to release it to you. Unfortunately, frequently, the profile in not made public, and even if it is made public, they may have chosen not to display their email address. In this case, you have no recourse.

If you are creative, there will always be a way around a problem.

BLOGGER WILL NOT HELP YOU GET A LONG UNUSED BLOGSPOT URL