Enter your last jump date and your currency window, and read the date you stop being current. USPA SIM 5-2 sets 30 days for students, 60 for an A license, 90 for a B and 180 for a C or D. The section is quoted in full below.
Students who have not jumped within the preceding 30 days should make at least one jump under the direct supervision of an appropriately rated USPA Instructor.
USPA A-license holders who have not made a freefall skydive within the preceding 60 days should make at least one jump under the supervision of a currently rated USPA instructional rating holder until demonstrating altitude awareness, freefall control on all axes, tracking, and canopy skills sufficient for safely jumping in groups.
USPA B-license holders who have not made a freefall skydive within the preceding 90 days should make at least one jump under the supervision of a USPA instructional rating holder until demonstrating the ability to safely exercise the privileges of that license.
USPA C and D-license holders who have not made a freefall skydive within the preceding 180 days should make at least one jump under the supervision of a USPA instructional rating holder until demonstrating the ability to safely exercise the privileges of that license.