[coldcode]

The problem with questions about estimation is that often the answers to the question come from a providing estimates to external customers standpoint. Providing estimates to things when you are building for internal use is much more complex as you have to consider politics, competition (internally) and often you have to estimate based on support from other teams who may not have the same priorities as you. Often too you have incomplete information and even incorrect information, your requirements may be sketchy and potentially no one actually knows what is needed or where it will go. That's incredibly difficult to manage and a different problem than providing estimates to a customer.