I feel like two years is kind of the limit that I've seen so far.
1	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	2	nsubj	2:nsubj	Discourse=explanation-justify:177->176:2|Entity=(21-person-giv:act-cf1*-1-ana)
2	feel	feel	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	0:root	_
3	like	like	SCONJ	IN	_	10	mark	10:mark	_
4	two	two	NUM	CD	NumForm=Word|NumType=Card	5	nummod	5:nummod	Entity=(90-time-giv:act-cf2-2-coref
5	years	year	NOUN	NNS	Number=Plur	10	nsubj	10:nsubj	Entity=90)
6	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	cop	10:cop	_
7	kind	kind	NOUN	NN	Number=Sing	10	obl:npmod	10:obl:npmod	_
8	of	of	ADP	IN	_	7	fixed	7:fixed	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	10:det	Entity=(90-time-giv:act-cf2-2-coref
10	limit	limit	NOUN	NN	Number=Sing	2	advcl	2:advcl:like|14:obj	_
11	that	that	PRON	WDT	PronType=Rel	14	obj	10:ref	Discourse=elaboration-attribute:178->177:0
12-13	I've	_	_	_	_	_	_	_	_
12	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	14	nsubj	14:nsubj	Entity=(21-person-giv:act-cf1*-1-ana)
13	've	have	AUX	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	14	aux	14:aux	_
14	seen	see	VERB	VBN	Tense=Past|VerbForm=Part	10	acl:relcl	10:acl:relcl	_
15	so	so	ADV	RB	_	16	advmod	16:advmod	_
16	far	far	ADV	RB	Degree=Pos	14	advmod	14:advmod	Entity=90)|SpaceAfter=No
17	.	.	PUNCT	.	_	2	punct	2:punct	_
