Re: 1st day back to work tomorrow...
Your first few days back will be hard - you'll be finding your schedule and rhythm, for both working and pumping.
Rinsing the pump parts between pumpings may be enough. Rinse them well, in hot water, and wash them well each evening. That will save you a few minutes.
Pump whatever you can in your 15min. Have everything set up that morning, so that all you need to do is turn it on.
You could try explaining to your employer what you're doing, and why it's important to you - health issues, allergies, etc - so that they'll be understanding. Explain that you'll do your best to stay within your 15min break, and that after the initial adjustment period (probably just a few days), you'll be well within that time frame.
There are lots of old threads here on working and breastfeeding, please read them!
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