Smaller bombs will detonate quicker than bigger bombs because of greater surface area relative to volume.

One also has to consider that the sun is so big that its gravity is going to play a significant role, in that it will "slow down" an explosion... it is collapsing gravitationally at the same rate as it is exploding... gravitational equilibrium. A bomb will explode quicker than it otherwise would if the surrounding medium is lower pressure.

I guess bigger stars burn quicker than smaller stars because they get hotter? Is this the same logic as a small fire burning for longer than a large fire?