I am with willadvise. I retired after 42 years last October. During that time I had numerous trainees and here is no way I'd go along with a break like the one described. Experienced controllers require a familiarisation shift after leave and they know what they are doing.
A trainee will be busy enough as it is without making it more difficult on himself. Added to the lack of continuity, in all likelihood there will be new documentation published whilst away. (TLI, LOA, AIRAC update) which has to be assimilated.