Let us Enter Through the Boss Gate

[Snugglebutt]

Bumping it up from 15 seconds to 30 seconds would be okay in my opinion but no more than that. There generally is no major phase change or major party wipe style attacks during first 30 seconds in almost all fights I recall so adding 15 more seconds to the timer would be okay with me but any more than that I think you start getting too close to phase shifts or major mechanics. 90 seconds is certainly too long.