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You might try increasing D value slightly in G71 cycle to decrease the number of rough passes. As written it might be taking final rough pass at nearly finish value.

Sample: 2.00 dia. bore 3.00 long in a blank with an existing 1" thru hole

T7(ID TURN)
G96S1000M4
G0X1.Z.1M8 (SAFE APPROACH)
G71P10Q20U-.05D.1F.012 (CANNED CYCLE CALL)
N10G0X2.1 (START POINT...

There are a variety of ways to reduce cycle time. One is surface speed, another is depth of cut and a third is feed rate. Altering one or all of these can shorten your cycle time. An uncoated...

Kinda late to the party here....but here's my two cents worth. HSS vs. Carbide. HSS is a cheaper method but the drawbacks kind of negate that. To get repeatable performance you have to learn how to...

Perhaps face groove leaving about .050 in Z. Then remove from lathe and smack ,beat, or press slug out. A 6" slug loose in a lathe is not pretty.....believe me.