Yes, a lot of members have shared their letter templates for work experience reference letter. I'm assuming that you will apply under NOC 4012, which is TA/RA, and the reason why you will need to document your number of hours is because HR will most likely not have such information, and I think you are funded by a combination of taxable and non-taxable funding.
In most cases, HR can only provide number of hours for taxable parts (maybe TA), but for RA, it is usually non-taxable, and nobody else can give you number of hours except for your supervisor (or department head), so you will have to draft your own letter of reference, have your advisor or department head read it, and if they agree, you have them sign on department letterhead. These requirements are written on the CIC checklist for FSWP, so better check that one out as well. Also, make sure that your job descriptions match those written on the HRSDC website
