Probably the lifetime of the mainframe versus the long running cost of hosting it on AWS? 8 years, you know what you need it for, might be worth it? Not if you

Probably the lifetime of the mainframe versus the long running cost of hosting it on AWS? 8 years, you know what you need it for, might be worth it? Not if you don't have very large POs in hand, however. This includes most start ups.