Is a 2-week break between adjuvant radiotherapy & chemo okay?

My relative has been diagnosed with stage 2b and has undergone whipple on July with 3/15 nodes positive and one area with close margin. Adjuvant FolFirinox is started in August and after the fourth cycle, adjuvant radiotherapy with 5FU has started in October. Since the adjuvant radiotherapy is coming to an end, doctor suggests to continue with the 5th cycle of Folfurinox next week right after radiotherapy ends, but my relative is worn up. May I know will resting 2 weeks between the end of adjuvant radiotherapy and the start of adjuvant chemotherapy will bring a large impact on the results ? Since the CA19.9 is less than 30 now but with my relative work out I’m not sure if it’s possible to take a rest for 2 weeks before continuing the intensive adjuvant chemotherapy. Thank you very much.