I specify 60 days rather than 45, to allow time at the end to earn money by traditional freelancing should the value not double, as a contingency to make up any shortfall.
Just want to point out that if for whatever reason the BTM price alone does not cover the loan(I think it will, but regardless) Mark will easily be able to repay it through his regular job as a professional freelance programmer.
The risks are minimal considering the project rests on funding and the 10% interest is very generous in my opinion.
I would do it myself but I've also taken loans for Bitmark related expenses in the short term and will probably do so again since I believe the project is easily worth it and a good investment.