It's not about believing, it's about knowing. You have to couple that time interval with the company they worked for.

At one company it took them 2 weeks to set-up my email, 3 months to decide on which project to work on and in about 6 months I was delivering something. So 6 months "experience" actually meant zero. I was ready to deliver from day 1 but...

At another company I had all the accounts created by the end of day 1, already working on bugs the second day. Some projects took 1 month in total. 6 months could mean 6 projects. The amount of skills accumulated in that time was way over the skills accumulated at the first company.

As you can see the time interval is useless. I think it's fairer if the recruiter simply rolls a dice.