Training took to long

[vitusdama]

Hello, so I have some problems with my custom dataset (MUSCIMA++)
My custom dataset consists of 3 big images and 2472 bbs and each image has ~2500 height and ~3450 width
Each bb has ~100 height and ~60 width
I train with 40 epochs and 100 steps and it took 8 hrs per epoch
Here's the screenshot of the training progress

Please help me