Yes you can, but it's better to wash them by hand to prolong their life.

Yes, please do get in touch and we can discuss your requirements.

The longer the better, but I would say ideally a month, sometimes I can complete one in less depending on how busy I am.

Yes I can, within the UK.

I wouldn't recommend it as the glaze becomes extremely hot. Its better to use a microwaveable container and then transfer the food to your bowl or plate.