The Timeline

I don't really think there is a set time for them to get their names. What we have is an estimated time and there have been times where cats just get their names later on. Depends on how fast they learn and how satisfactory their skills are.

It is pretty odd. However warrior ceremonies have always been inconsistent with the characters ages. In Into the wild Firestar and Graystripe were apprentices for only 3-4 months before getting their names. Brackenfur was an apprentice for 6 months and as was Cloudtail. Squirrelflight, we can't judge because she was only ever doing apprentice stuff for 2 months before going on adventures. Whitewing was an apprentice for a year and a half, partially because it was extended for Birchfall and partially because the erins forgot that she was older than Squirrelflight. And Spiderleg was an apprentice for about six months. In power of three all of the apprentices were apprentices for a year before becoming warriors. The exceptions are Cinderheart who had hers extended due to injury and Icecloud and Foxleap who were apprentices for nine months. In oots the length off apprenticeship appears to range between 6 to 9 months.

pot and oots were the only series that kept the apprentices ages in order and had a consistent apprenticeship period and even then, they were oddly long periods of time. So I can't say I'm surprised this happened.

This is as accurate as can be, I'm saving this.