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I don't know for an ASR1K, it might depend on your IOS version.
That noted, generally Cisco recommends not to exceed one third of link bandwidth for LLQ. They make this recommendation to leave sufficient bandwidth for other traffic, but another issue is, if you use too much bandwidth for LLQ, the traffic may queue itself, introducing delay and/or jitter to your VoIP traffic. In general, staying at or below one third should be great, going to 50% is probably okay, but going above two thirds is when you're really likely to start to self queue. I.e. if your VoIP needs more than about half to two thirds of your link bandwidth, you probably start to need to consider obtaining more bandwidth.
