I have 2 Pfaffs both are work-horses. They will sew the most delicate fabric to quilts with no problem. Never have to worry will the Pfaff sewing any thing. I quilt on my machine.
Don'g worry about the hours just sew and enjoy the machine.
Sewing machine are made to be used, not just collect dust.
My mother wore out 2 of the older model,she purchased new both new, Singers(during the 40' 50's and 60's). She got a new machine in the 80's my sister has it now.