Is the print going to fade or wash off?

The design is applied by dye sublimation, which bonds the ink into the ceramic coating rather than sitting on top. That method typically holds up through repeated dishwasher cycles better than vinyl or transfer prints.

Can I put it in the microwave and dishwasher?

Yes. The mug is ceramic and rated microwave and dishwasher safe, so reheating coffee and running it through a normal cycle are both fine.

Which size should I pick?

The 11oz is a standard desk mug; the 15oz holds more for long sessions or people who drink tea by the pot. Both are the same ceramic body, so the choice is capacity, not build.

Is this a good gift for a non-SAP coworker?

The joke depends on knowing SAP work, so it lands best with consultants, basis admins or in-house support staff. For others it reads as a plain mug with an odd sentence.

Does the colored interior stain?

Any colored ceramic interior can show tea and coffee residue sooner than white, though the glaze wipes clean. A rinse after use keeps it looking new longer.