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accuracy

Accuracy of 28 X1 without external resonator?

In my circuit, I have 2 Picaxe 28X1s. The only suitable external ceramic resonator I have is on the 28 pin project board and I don't want to ruin it by accident during desoldering. I am making my own board for each Picaxe, and need to know how accurate the timing of the Picaxes will be only using the internal resonator. Picaxe A is using 2 PWM channels driving motors on a separate power supply handled by an L293D, all other outputs to drive other ICs, will read 1 ADC channel, 2 digital sensors, and 1 digital input.