A worker at a workbench performs a repetitive assembly task where they assemble product units. Twenty$-$five components make up each product. During the assembly, the worker uses various hand tools. For the work cycle the standard time of $7\mathrm{.}45$ min has been determined. For this calculation, a PFD allowance factor of $15\%$ was used. Determine the number of standard hours of work accomplished if the worker completes $75$ product units during an $8-$hour shift. Units should be entered as $"$hr$".$