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The length of the recording time an IDE type HDD can record, is decided by the following factors:
1) the space of HDD 2) the recording rate 3) the recording quality (resulution).

NTSC System (for 4 channel contineous recording):

Recording Rate (fps)			30	15	8	4	2	1
Recording Quality	Multiplex	Best	50 hr	100 hr	187 hr	375 hr	750 hr	1500 hr
		High	62 hr	125 hr	235 hr	468 hr	937 hr	1875 hr
		Normal	100 hr	200 hr	375 hr	750 hr	1500 hr	2998 hr
		Basic	167 hr	333 hr	625 hr	1250 hr	2498 hr	4996 hr
	Quad-Field	Best	48 hr	95 hr	178 hr	356 hr	712 hr	1425 hr
		High	59 hr	118 hr	223 hr	445 hr	890 hr	1781 hr
		Normal	95 hr	190 hr	356 hr	712 hr	1425 hr	2848 hr
		Basic	158 hr	316 hr	594 hr	1187 hr	2373 hr	4746 hr
	Quad-Frame	Best	24 hr	48 hr	89 hr	178 hr	356 hr	713 hr
		High	30 hr	59 hr	112 hr	223 hr	445 hr	890 hr
		Normal	48 hr	95 hr	178 hr	356 hr	713 hr	1424 hr
		Basic	79 hr	158 hr	297 hr	594 hr	1187 hr	2373 hr
HDD Space			250 GB

PAL System (for 4 channel contineous recording):

Recording Rate (fps)			25	12	6	3	2	1
Recording Quality	Multiplex	Best	50 hr	104 hr	210 hr	423 hr	633 hr	1266 hr
		High	62 hr	131 hr	265 hr	527 hr	792 hr	1583 hr
		Normal	102 hr	210 hr	422 hr	844 hr	1266 hr	2542 hr
		Basic	168 hr	350 hr	704 hr	1406 hr	2110 hr	4218 hr
	Quad-Field	Best	48 hr	98 hr	200 hr	400 hr	600 hr	1202 hr
		High	58 hr	124 hr	251 hr	500 hr	752 hr	1503 hr
		Normal	98 hr	200 hr	400 hr	800 hr	1202 hr	2414 hr
		Basic	160 hr	332 hr	668 hr	1335 hr	2004 hr	4005 hr
	Quad-Frame	Best	24 hr	50 hr	100 hr	200 hr	300 hr	600 hr
		High	30 hr	62 hr	125 hr	250 hr	376 hr	751 hr
		Normal	49 hr	100 hr	200 hr	400 hr	601 hr	1207 hr
		Basic	80 hr	166 hr	334 hr	667 hr	1002 hr	2003 hr
HDD Space			250 GB

(For reference only)