Although I cannot speak for the 1914 national guard, I can speak too what I personally saw in the 1980's Michigan army national guard, and then later in the US army Infantry.
In 1914, the USA does not have a large standing army, something like ~200,000 total troops, while in 1980 we had 2,000,000+. This is just to get a rough idea of the respective size of the US military from pre WWI to when I served. This is to be understood as pointing out that in the time I served, we had a much larger military, with more funding and infrastructure than the 1914 forces. The level of unpreparedness that I experienced first hand leads me to the conclusion that the 1980's national guard would have needed several months to train up to wartime standards, both because of individual needs/shortcomings as well as the much harder higher level shortcomings, and this is with 10 times as many folks in the service, and thus giving the capability to deploy some (totally unprepared troops), train some others up to speed, and recruit new folks to enlarge the forces. Getting a small group of men trained up in personal skills is the easy part, so say at the company level you have guys ready to rock within a week. Now try getting 5 such companies, that may never have worked with another company at all, to be competently working together, and then scale that up to divisional level...
In 1914, with fewer professional officers, and much more limited bases/infrastructure, I would not be optimistic about getting any force combat capable above battalion level for at least 1-3 months, and that is assuming that you can even get them mobilized and deployed in that time frame and do all the needed training, and remember, any commitment of forces to combat deployment, takes away from getting new folks trained. When your outnumbered as badly as the USA is going to be in mid/late 1914, the very first priority is going to be expansion of the armed forces as quickly as possible, and this doesn't leave room for deploying multiple NG divisions for service outside the US.
The most I could see the US doing with ground troop commitments right off the bat would be to use small forces, and take UK coaling stations/stockpiles in the caribbean islands, to forstal RN actions there and off the US coasts.
Thats where the 1916 NG mobilization in support of the Punitive Expedition was so valuable. 6-8 months of hard training all the way to division level, the first time this had occured since maybe the Spanish American war or even the ACW.