The ornamental design of a refrigerationtime/temperature monitor, as shown and described.
FIG. 1 is a top perspective view of the refrigeration time/temperature monitor showing a new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof; broken line showing of structural features is included for the purpose of illustrating non-claimed subject matter and forms no part of the claimed design;