+1 I believe this would be fair, 10 seconds does seem like a very long time.
Massive -1, 2-4 minutes is way too long, this opens up opportunities for literally anyone walking by to easily counter your raid, or just raid and take everything you fought for, think about it the base would be wide open for 2-4 minutes, this would definitely hurt the raider more than the person being raided. I suggest a range from maybe 15-30 seconds for cracking fading doors if this change was to take place.