Invest on what you can afford to lose as always as yet this is the primary rule when it comes to investment which specifically means that its not ideal on spending up the funds which are intended to pay up your monthly bull. Investing is really that reflecting out on your financial capacity on whatever means you would really be getting it but if we do speak about that sole income source then having this kind of investment set-up would really be that a huge challenge. So in the end of the day it would really be just that depending on you on how you would really be handling up yourself when it comes to investment decision
Well investing with what you can afford to lose is nice, but still to me is going to reduce the rate of one accummulation of Bitcoin. For instance the money one may agree to risk may be as small as $10 weekly as DCAing,which may take some time to turn to something nice , expecially this time around Bitcoin price is high , so that amount won't be able to coverup some nice quantities in the individual accumulating phase.
So to me the right thing is that one can start his accummulation or investment of bitcoin with what he or she can afford to lose, as time goes on after understanding more and seeing the beauty of Bitcoin he or she can increase his rate of Accumulating without any fear of losing that much aslong he or she possess some good discretionary income. Because alot of investors have use such mindset to affect their investment negatively when it comes to accumulating. Tho one should accumulate in a way that he or she won't over doing it leading them in putting their hands in their emergency funds. But still one should try to be as aggressive he or she can .
There's should be a improvement and the accumulation rate should go higher and the timeline of accumulation should depends if you have reserve fund to spend since with this you may get more better result.