End in sight for thousand li march

I don't recall how long ago this started, but I was just told that we now have roughly 6 weeks worth of overtime shifts to go.  It's nice because it's certainly leaving me feeling drained.  I would not like to do that on a continous basis.  At the same time though, I'm going to want the money.  It is a fairly decent chunk, probably about $400/month.  Then as I recall from what people told me, things usually slow a bit and then we start building inventory and run all out towards the start of spring.  So this will probably mean overtime will be available again for a good portion of next year.  I wonder how much of an impact doing overtime has on my estimates.  Though everything still feels so far off in the future right now, so it's hard to tell.