OK, let's do this - On Januray 3rd, I am at work again. I will take a N70, format it and will clock the startup time. Then I'll post it here.
BTW, generally, the fastest start time for a phone is when it is newly formatted. So - if you have anything additionally installed, it will start slowing down. So, if you want to speed it up, you need to uninstall applications and I doubt you will want that.
So no - there's no reasonable way to speed booting up.
As a reference - my N73 took more than a minute and a half to start with full set of applications I use. The N82 I use now starts in 15 seconds
Nokia 7110 -> Siemens C45 -> Siemens C55 -> Siemens M55 -> Siemens M65 -> Nokia 6131 -> Nokia N73 -> Nokia N82 -> HTC Wildfire -> HTC Desire HD -> Nokia Lumia 800 + Sennheiser CX 500
If I've helped, use the Kudos button to thank