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Yeh, you could probably build it yourself in that amount of time if you had everything prepped and all the materials delivered on day 1 etc.
The other thing is what are you going to put it on, are you going to concrete that area? Or lay slabs? I assume it’s not going straight on those chippings. Laying whatever foundation you’re going to use is going to eat into any time you’ve got. Although to be fair to you could be building studwork and cutting other timber whilst foundations are being laid if you got someone in to do it for example.
Yeh he’s retired so he’s got time on his side! If you want any specifics let me know and I’ll find out.