Optimizing appliance based on preparation time

A computer program product for implementing a program that manages a device, comprising a non-transitory tangible storage device having program code embodied therewith, the program code executable by a processor of a computer to perform a method, the method comprising:

• estimating a time period for a user to arrive at a location, wherein the estimated time period is based on one or more time constraints;
• identifying one or more appliances needed based on at least an instruction set;
• generating and sending one or more operating commands to the identified one or more appliances based on the estimated time period;
• updating the estimated time period based on a change in the one or more time constraints;
• and
• generating and sending one or more updated operating commands to the identified one or more appliances, based on the updated estimated time period.

A computer system for implementing a program that manages a device, comprising:

• one or more computer devices each having one or more processors and one or more tangible storage devices;
• and
• a program embodied on at least one of the one or more storage devices, the program having a plurality of program instructions for execution by the one or more processors, the program instructions comprising instructions for:
• estimating a time period for a user to arrive at a location, wherein the estimated time period is based on one or more time constraints;
• identifying one or more appliances needed based on at least an instruction set;
• generating and sending one or more operating commands to the identified one or more appliances based on the estimated time period;
• updating the estimated time period based on a change in the one or more time constraints;
• and
• generating and sending one or more updated operating commands to the identified one or more appliances, based on the updated estimated time period.